21113031402 has 16 divisors (see below), whose sum is σ = 46917847680. Its totient is φ = 7037677116.

The previous prime is 21113031377. The next prime is 21113031403. The reversal of 21113031402 is 20413031112.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21113031403) 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, 195490978 + ... + 195491085.

It is an arithmetic number, because the mean of its divisors is an integer number (2932365480).

Almost surely, 2^21113031402 is an apocalyptic number.

21113031402 is an abundant number, since it is smaller than the sum of its proper divisors (25804816278).

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

21113031402 is a wasteful number, since it uses less digits than its factorization.

21113031402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390982074 (or 390982068 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21113031402 its reverse (20413031112), we get a palindrome (41526062514).

The spelling of 21113031402 in words is "twenty-one billion, one hundred thirteen million, thirty-one thousand, four hundred two".