31121422400 has 84 divisors (see below), whose sum is σ = 80608657680. Its totient is φ = 11793369600.

The previous prime is 31121422399. The next prime is 31121422421. The reversal of 31121422400 is 422412113.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 481466 + ... + 542265.

Almost surely, 2^31121422400 is an apocalyptic number.

It is an amenable number.

31121422400 is an abundant number, since it is smaller than the sum of its proper divisors (49487235280).

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

31121422400 is a wasteful number, since it uses less digits than its factorization.

31121422400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023772 (or 1023757 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 31121422400 its reverse (422412113), we get a palindrome (31543834513).

The spelling of 31121422400 in words is "thirty-one billion, one hundred twenty-one million, four hundred twenty-two thousand, four hundred".