21601667630331 has 12 divisors (see below), whose sum is σ = 31202611284208. Its totient is φ = 14401018299024.

The previous prime is 21601667630269. The next prime is 21601667630359. The reversal of 21601667630331 is 13303676610612.

21601667630331 is a `hidden beast` number, since 2 + 1 + 6 + 0 + 1 + 6 + 6 + 7 + 630 + 3 + 3 + 1 = 666.

It is not a de Polignac number, because 21601667630331 - 2⁷ = 21601667630203 is a prime.

It is a super-2 number, since 2×21601667630331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21601667630831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6309175 + ... + 9110928.

Almost surely, 2^{21601667630331} is an apocalyptic number.

21601667630331 is a deficient number, since it is larger than the sum of its proper divisors (9600943653877).

21601667630331 is a wasteful number, since it uses less digits than its factorization.

21601667630331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15575762 (or 15575759 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 45.

The spelling of 21601667630331 in words is "twenty-one trillion, six hundred one billion, six hundred sixty-seven million, six hundred thirty thousand, three hundred thirty-one".