21506832441256 has 16 divisors (see below), whose sum is σ = 40327797677940. Its totient is φ = 10752753060480.

The previous prime is 21506832441223. The next prime is 21506832441337. The reversal of 21506832441256 is 65214423860512.

It can be written as a sum of positive squares in 2 ways, for example, as 21499598938756 + 7233502500 = 4636766^2 + 85050^2 .

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, 82757175 + ... + 83016646.

Almost surely, 2^{21506832441256} is an apocalyptic number.

It is an amenable number.

21506832441256 is a deficient number, since it is larger than the sum of its proper divisors (18820965236684).

21506832441256 is a wasteful number, since it uses less digits than its factorization.

21506832441256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165790044 (or 165790040 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 49.

The spelling of 21506832441256 in words is "twenty-one trillion, five hundred six billion, eight hundred thirty-two million, four hundred forty-one thousand, two hundred fifty-six".