21650113620 has 96 divisors (see below), whose sum is σ = 67401734400. Its totient is φ = 5769436032.

The previous prime is 21650113619. The next prime is 21650113631. The reversal of 21650113620 is 2631105612.

21650113620 is a `hidden beast` number, since 2 + 1 + 6 + 501 + 136 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 829002 + ... + 854718.

It is an arithmetic number, because the mean of its divisors is an integer number (702101400).

Almost surely, 2^21650113620 is an apocalyptic number.

21650113620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21650113620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33700867200).

21650113620 is an abundant number, since it is smaller than the sum of its proper divisors (45751620780).

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

21650113620 is a wasteful number, since it uses less digits than its factorization.

21650113620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27294 (or 27286 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The spelling of 21650113620 in words is "twenty-one billion, six hundred fifty million, one hundred thirteen thousand, six hundred twenty".