21631516040255 has 32 divisors (see below), whose sum is σ = 29983835914560. Its totient is φ = 14806365880320.

The previous prime is 21631516040243. The next prime is 21631516040261. The reversal of 21631516040255 is 55204061513612.

It is not a de Polignac number, because 21631516040255 - 2⁶ = 21631516040191 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, 76357511 + ... + 76640279.

It is an arithmetic number, because the mean of its divisors is an integer number (936994872330).

Almost surely, 2^{21631516040255} is an apocalyptic number.

21631516040255 is a deficient number, since it is larger than the sum of its proper divisors (8352319874305).

21631516040255 is a wasteful number, since it uses less digits than its factorization.

21631516040255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364619.

The product of its (nonzero) digits is 216000, while the sum is 41.

Adding to 21631516040255 its reverse (55204061513612), we get a palindrome (76835577553867).

The spelling of 21631516040255 in words is "twenty-one trillion, six hundred thirty-one billion, five hundred sixteen million, forty thousand, two hundred fifty-five".