12121307568 has 60 divisors (see below), whose sum is σ = 34750228968. Its totient is φ = 3941886720.

The previous prime is 12121307543. The next prime is 12121307591. The reversal of 12121307568 is 86570312121.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1020630 + ... + 1032437.

Almost surely, 2^12121307568 is an apocalyptic number.

12121307568 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12121307568 is an abundant number, since it is smaller than the sum of its proper divisors (22628921400).

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

12121307568 is a wasteful number, since it uses less digits than its factorization.

12121307568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2053122 (or 2053113 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

Adding to 12121307568 its reverse (86570312121), we get a palindrome (98691619689).

The spelling of 12121307568 in words is "twelve billion, one hundred twenty-one million, three hundred seven thousand, five hundred sixty-eight".