21331064156 has 12 divisors (see below), whose sum is σ = 38952378192. Its totient is φ = 10201813248.

The previous prime is 21331064149. The next prime is 21331064171. The reversal of 21331064156 is 65146013312.

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, 115929605 + ... + 115929788.

It is an arithmetic number, because the mean of its divisors is an integer number (3246031516).

Almost surely, 2^21331064156 is an apocalyptic number.

It is an amenable number.

21331064156 is a deficient number, since it is larger than the sum of its proper divisors (17621314036).

21331064156 is a wasteful number, since it uses less digits than its factorization.

21331064156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231859420 (or 231859418 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

Adding to 21331064156 its reverse (65146013312), we get a palindrome (86477077468).

The spelling of 21331064156 in words is "twenty-one billion, three hundred thirty-one million, sixty-four thousand, one hundred fifty-six".