21327198631 has 2 divisors, whose sum is σ = 21327198632. Its totient is φ = 21327198630.

The previous prime is 21327198583. The next prime is 21327198653. The reversal of 21327198631 is 13689172312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21327198631 - 2³³ = 12737264039 is a prime.

It is a super-2 number, since 2×21327198631² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21327198031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10663599315 + 10663599316.

It is an arithmetic number, because the mean of its divisors is an integer number (10663599316).

Almost surely, 2^21327198631 is an apocalyptic number.

21327198631 is a deficient number, since it is larger than the sum of its proper divisors (1).

21327198631 is an equidigital number, since it uses as much as digits as its factorization.

21327198631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The spelling of 21327198631 in words is "twenty-one billion, three hundred twenty-seven million, one hundred ninety-eight thousand, six hundred thirty-one".