21214667963631 has 4 divisors (see below), whose sum is σ = 28286223951512. Its totient is φ = 14143111975752.

The previous prime is 21214667963627. The next prime is 21214667963779. The reversal of 21214667963631 is 13636976641212.

It is a happy number.

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

It is not a de Polignac number, because 21214667963631 - 2² = 21214667963627 is a prime.

It is a super-2 number, since 2×21214667963631² (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 (21214667963131) 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, 3535777993936 + ... + 3535777993941.

It is an arithmetic number, because the mean of its divisors is an integer number (7071555987878).

Almost surely, 2^{21214667963631} is an apocalyptic number.

21214667963631 is a deficient number, since it is larger than the sum of its proper divisors (7071555987881).

21214667963631 is an equidigital number, since it uses as much as digits as its factorization.

21214667963631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7071555987880.

The product of its digits is 11757312, while the sum is 57.

The spelling of 21214667963631 in words is "twenty-one trillion, two hundred fourteen billion, six hundred sixty-seven million, nine hundred sixty-three thousand, six hundred thirty-one".