21362840631 has 48 divisors (see below), whose sum is σ = 34074641952. Its totient is φ = 12789504000.

The previous prime is 21362840623. The next prime is 21362840641. The reversal of 21362840631 is 13604826312.

21362840631 is a `hidden beast` number, since 2 + 13 + 6 + 2 + 8 + 4 + 0 + 631 = 666.

It is not a de Polignac number, because 21362840631 - 2³ = 21362840623 is a prime.

It is a super-2 number, since 2×21362840631² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21362840641) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3498481 + ... + 3504581.

It is an arithmetic number, because the mean of its divisors is an integer number (709888374).

Almost surely, 2^21362840631 is an apocalyptic number.

21362840631 is a deficient number, since it is larger than the sum of its proper divisors (12711801321).

21362840631 is a wasteful number, since it uses less digits than its factorization.

21362840631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6544 (or 6541 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 21362840631 in words is "twenty-one billion, three hundred sixty-two million, eight hundred forty thousand, six hundred thirty-one".