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121220011212 = 22382311227271
BaseRepresentation
bin111000011100101000…
…1101001010011001100
3102120220000211121020220
41300321101221103030
53441224310324322
6131404313311340
711520642044256
oct1607121512314
9376800747226
10121220011212
1147455599653
121b5b0405550
13b57ab970b1
145c1d3a4cd6
15324714555c
hex1c394694cc

121220011212 has 24 divisors (see below), whose sum is σ = 282881286912. Its totient is φ = 40401728400.

The previous prime is 121220011201. The next prime is 121220011217. The reversal of 121220011212 is 212110022121.

It is a super-2 number, since 2×1212200112122 (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121220011191 and 121220011200.

It is not an unprimeable number, because it can be changed into a prime (121220011217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514864 + ... + 712407.

It is an arithmetic number, because the mean of its divisors is an integer number (11786720288).

Almost surely, 2121220011212 is an apocalyptic number.

121220011212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121220011212 is an abundant number, since it is smaller than the sum of its proper divisors (161661275700).

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

121220011212 is a wasteful number, since it uses less digits than its factorization.

121220011212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235509 (or 1235507 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121220011212 its reverse (212110022121), we get a palindrome (333330033333).

The spelling of 121220011212 in words is "one hundred twenty-one billion, two hundred twenty million, eleven thousand, two hundred twelve".

Divisors: 1 2 3 4 6 12 8231 16462 24693 32924 49386 98772 1227271 2454542 3681813 4909084 7363626 14727252 10101667601 20203335202 30305002803 40406670404 60610005606 121220011212