31121024220402 has 64 divisors (see below), whose sum is σ = 63539324605440. Its totient is φ = 10158226629824.

The previous prime is 31121024220371. The next prime is 31121024220413. The reversal of 31121024220402 is 20402242012113.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1651937299 + ... + 1651956137.

It is an arithmetic number, because the mean of its divisors is an integer number (992801946960).

Almost surely, 2^{31121024220402} is an apocalyptic number.

31121024220402 is an abundant number, since it is smaller than the sum of its proper divisors (32418300385038).

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

31121024220402 is a wasteful number, since it uses less digits than its factorization.

31121024220402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28687.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 31121024220402 its reverse (20402242012113), we get a palindrome (51523266232515).

The spelling of 31121024220402 in words is "thirty-one trillion, one hundred twenty-one billion, twenty-four million, two hundred twenty thousand, four hundred two".