21321031134 has 32 divisors (see below), whose sum is σ = 48623531040. Its totient is φ = 6174415872.

The previous prime is 21321031063. The next prime is 21321031139. The reversal of 21321031134 is 43113012312.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21321031134.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321031139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8038279 + ... + 8040930.

It is an arithmetic number, because the mean of its divisors is an integer number (1519485345).

Almost surely, 2^21321031134 is an apocalyptic number.

21321031134 is an abundant number, since it is smaller than the sum of its proper divisors (27302499906).

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

21321031134 is a wasteful number, since it uses less digits than its factorization.

21321031134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16079244.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21321031134 its reverse (43113012312), we get a palindrome (64434043446).

The spelling of 21321031134 in words is "twenty-one billion, three hundred twenty-one million, thirty-one thousand, one hundred thirty-four".