21331642442056 has 24 divisors (see below), whose sum is σ = 41811430551030. Its totient is φ = 10202089861568.

The previous prime is 21331642442003. The next prime is 21331642442059. The reversal of 21331642442056 is 65024424613312.

It can be written as a sum of positive squares in only one way, i.e., 12066522216100 + 9265120225956 = 3473690^2 + 3043866^2 .

It is not an unprimeable number, because it can be changed into a prime (21331642442059) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2520274885 + ... + 2520283348.

Almost surely, 2^{21331642442056} is an apocalyptic number.

It is an amenable number.

21331642442056 is a deficient number, since it is larger than the sum of its proper divisors (20479788108974).

21331642442056 is a wasteful number, since it uses less digits than its factorization.

21331642442056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5040558285 (or 5040558258 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 43.

The spelling of 21331642442056 in words is "twenty-one trillion, three hundred thirty-one billion, six hundred forty-two million, four hundred forty-two thousand, fifty-six".