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121200021000021 = 35310165141115859
BaseRepresentation
bin11011100011101100010100…
…001100101100111101010101
3120220010121102212000001112110
4123203230110030230331111
5111341220120334000041
61105434304311341233
734346261335322565
oct3343542414547525
9526117385001473
10121200021000021
11356887051a3997
1211715461981819
135282161188012
1421d01802a2da5
15e02a560dd516
hex6e3b1432cf55

121200021000021 has 32 divisors (see below), whose sum is σ = 166283261907840. Its totient is φ = 78488697248000.

The previous prime is 121200020999899. The next prime is 121200021000031. The reversal of 121200021000021 is 120000120002121.

It is not a de Polignac number, because 121200021000021 - 239 = 120650265186133 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121200020999970 and 121200021000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200021000031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1046041390 + ... + 1046157248.

It is an arithmetic number, because the mean of its divisors is an integer number (5196351934620).

Almost surely, 2121200021000021 is an apocalyptic number.

It is an amenable number.

121200021000021 is a deficient number, since it is larger than the sum of its proper divisors (45083240907819).

121200021000021 is a wasteful number, since it uses less digits than its factorization.

121200021000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181157.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 121200021000021 its reverse (120000120002121), we get a palindrome (241200141002142).

The spelling of 121200021000021 in words is "one hundred twenty-one trillion, two hundred billion, twenty-one million, twenty-one", and thus it is an aban number.

Divisors: 1 3 53 101 159 303 5353 16059 65141 115859 195423 347577 3452473 6140527 6579241 10357419 11701759 18421581 19737723 35105277 348699773 620193227 1046099319 1860579681 7547171119 22641513357 400000069307 762264283019 1200000207921 2286792849057 40400007000007 121200021000021