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121200021000020 = 2256060001050001
BaseRepresentation
bin11011100011101100010100…
…001100101100111101010100
3120220010121102212000001112102
4123203230110030230331110
5111341220120334000040
61105434304311341232
734346261335322564
oct3343542414547524
9526117385001472
10121200021000020
11356887051a3996
1211715461981818
135282161188011
1421d01802a2da4
15e02a560dd515
hex6e3b1432cf54

121200021000020 has 12 divisors (see below), whose sum is σ = 254520044100084. Its totient is φ = 48480008400000.

The previous prime is 121200020999899. The next prime is 121200021000031. The reversal of 121200021000020 is 20000120002121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 73388383156804 + 47811637843216 = 8566702^2 + 6914596^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121200020999965 and 121200021000010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3030000524981 + ... + 3030000525020.

It is an arithmetic number, because the mean of its divisors is an integer number (21210003675007).

Almost surely, 2121200021000020 is an apocalyptic number.

121200021000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121200021000020 is an abundant number, since it is smaller than the sum of its proper divisors (133320023100064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121200021000020 is a wasteful number, since it uses less digits than its factorization.

121200021000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6060001050010 (or 6060001050008 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 121200021000020 its reverse (20000120002121), we get a palindrome (141200141002141).

The spelling of 121200021000020 in words is "one hundred twenty-one trillion, two hundred billion, twenty-one million, twenty", and thus it is an aban number.

Divisors: 1 2 4 5 10 20 6060001050001 12120002100002 24240004200004 30300005250005 60600010500010 121200021000020