21337472056 has 8 divisors (see below), whose sum is σ = 40007760120. Its totient is φ = 10668736024.

The previous prime is 21337472047. The next prime is 21337472059. The reversal of 21337472056 is 65027473312.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21337472059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333591996 + ... + 1333592011.

It is an arithmetic number, because the mean of its divisors is an integer number (5000970015).

Almost surely, 2^21337472056 is an apocalyptic number.

It is an amenable number.

21337472056 is a deficient number, since it is larger than the sum of its proper divisors (18670288064).

21337472056 is a wasteful number, since it uses less digits than its factorization.

21337472056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2667184013 (or 2667184009 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 40.

The spelling of 21337472056 in words is "twenty-one billion, three hundred thirty-seven million, four hundred seventy-two thousand, fifty-six".