121012656 has 40 divisors (see below), whose sum is σ = 313585584. Its totient is φ = 40212480.

The previous prime is 121012651. The next prime is 121012663. The reversal of 121012656 is 656210121.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (121012651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12436 + ... + 19916.

Almost surely, 2^121012656 is an apocalyptic number.

121012656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121012656 is an abundant number, since it is smaller than the sum of its proper divisors (192572928).

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

121012656 is a wasteful number, since it uses less digits than its factorization.

121012656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7829 (or 7823 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 121012656 is about 11000.5752576854. The cubic root of 121012656 is about 494.6259882644.

Adding to 121012656 its reverse (656210121), we get a palindrome (777222777).

The spelling of 121012656 in words is "one hundred twenty-one million, twelve thousand, six hundred fifty-six".