121231256 has 16 divisors (see below), whose sum is σ = 228816240. Its totient is φ = 60213600.

The previous prime is 121231247. The next prime is 121231291. The reversal of 121231256 is 652132121.

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, 48971 + ... + 51386.

It is an arithmetic number, because the mean of its divisors is an integer number (14301015).

Almost surely, 2^121231256 is an apocalyptic number.

It is an amenable number.

121231256 is a deficient number, since it is larger than the sum of its proper divisors (107584984).

121231256 is a wasteful number, since it uses less digits than its factorization.

121231256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100514 (or 100510 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 121231256 is about 11010.5066186802. The cubic root of 121231256 is about 494.9236436315.

Adding to 121231256 its reverse (652132121), we get a palindrome (773363377).

The spelling of 121231256 in words is "one hundred twenty-one million, two hundred thirty-one thousand, two hundred fifty-six".