21506832441255 has 32 divisors (see below), whose sum is σ = 39327227172864. Its totient is φ = 9831582867456.

The previous prime is 21506832441223. The next prime is 21506832441337. The reversal of 21506832441255 is 55214423860512.

It is a happy number.

It is not a de Polignac number, because 21506832441255 - 2⁵ = 21506832441223 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8475682 + ... + 10716848.

It is an arithmetic number, because the mean of its divisors is an integer number (1228975849152).

Almost surely, 2^{21506832441255} is an apocalyptic number.

21506832441255 is a deficient number, since it is larger than the sum of its proper divisors (17820394731609).

21506832441255 is a wasteful number, since it uses less digits than its factorization.

21506832441255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2332575.

The product of its (nonzero) digits is 2304000, while the sum is 48.

The spelling of 21506832441255 in words is "twenty-one trillion, five hundred six billion, eight hundred thirty-two million, four hundred forty-one thousand, two hundred fifty-five".