21113513226655 has 32 divisors (see below), whose sum is σ = 26873817615360. Its totient is φ = 15879567628800.

The previous prime is 21113513226653. The next prime is 21113513226679. The reversal of 21113513226655 is 55662231531112.

It is not a de Polignac number, because 21113513226655 - 2¹ = 21113513226653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113513226653) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13261822 + ... + 14768308.

It is an arithmetic number, because the mean of its divisors is an integer number (839806800480).

Almost surely, 2^{21113513226655} is an apocalyptic number.

21113513226655 is a deficient number, since it is larger than the sum of its proper divisors (5760304388705).

21113513226655 is a wasteful number, since it uses less digits than its factorization.

21113513226655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507639.

The product of its digits is 324000, while the sum is 43.

Adding to 21113513226655 its reverse (55662231531112), we get a palindrome (76775744757767).

The spelling of 21113513226655 in words is "twenty-one trillion, one hundred thirteen billion, five hundred thirteen million, two hundred twenty-six thousand, six hundred fifty-five".