21115514653255 has 32 divisors (see below), whose sum is σ = 27664681006080. Its totient is φ = 15344212490880.

The previous prime is 21115514653243. The next prime is 21115514653307. The reversal of 21115514653255 is 55235641551112.

It is not a de Polignac number, because 21115514653255 - 2⁵ = 21115514653223 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, 517986504 + ... + 518027266.

It is an arithmetic number, because the mean of its divisors is an integer number (864521281440).

Almost surely, 2^{21115514653255} is an apocalyptic number.

21115514653255 is a deficient number, since it is larger than the sum of its proper divisors (6549166352825).

21115514653255 is a wasteful number, since it uses less digits than its factorization.

21115514653255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48231.

The product of its digits is 900000, while the sum is 46.

The spelling of 21115514653255 in words is "twenty-one trillion, one hundred fifteen billion, five hundred fourteen million, six hundred fifty-three thousand, two hundred fifty-five".