21613431774616 has 48 divisors (see below), whose sum is σ = 44549362055520. Its totient is φ = 9823151131200.

The previous prime is 21613431774601. The next prime is 21613431774619. The reversal of 21613431774616 is 61647713431612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21613431774619) 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, 7112721 + ... + 9685951.

It is an arithmetic number, because the mean of its divisors is an integer number (928111709490).

Almost surely, 2^{21613431774616} is an apocalyptic number.

It is an amenable number.

21613431774616 is an abundant number, since it is smaller than the sum of its proper divisors (22935930280904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21613431774616 is a wasteful number, since it uses less digits than its factorization.

21613431774616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2581936 (or 2581921 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 52.

The spelling of 21613431774616 in words is "twenty-one trillion, six hundred thirteen billion, four hundred thirty-one million, seven hundred seventy-four thousand, six hundred sixteen".