21630755107231 has 4 divisors (see below), whose sum is σ = 21641842118464. Its totient is φ = 21619668096000.

The previous prime is 21630755107229. The next prime is 21630755107279. The reversal of 21630755107231 is 13270155703612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21630755107231 - 2¹ = 21630755107229 is a prime.

It is a super-2 number, since 2×21630755107231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21630755107331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5543502690 + ... + 5543506591.

It is an arithmetic number, because the mean of its divisors is an integer number (5410460529616).

Almost surely, 2^{21630755107231} is an apocalyptic number.

21630755107231 is a deficient number, since it is larger than the sum of its proper divisors (11087011233).

21630755107231 is a wasteful number, since it uses less digits than its factorization.

21630755107231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11087011232.

The product of its (nonzero) digits is 264600, while the sum is 43.

The spelling of 21630755107231 in words is "twenty-one trillion, six hundred thirty billion, seven hundred fifty-five million, one hundred seven thousand, two hundred thirty-one".