21915343620 has 72 divisors (see below), whose sum is σ = 70386936984. Its totient is φ = 5500320768.

The previous prime is 21915343613. The next prime is 21915343633. The reversal of 21915343620 is 2634351912.

21915343620 is a `hidden beast` number, since 2 + 1 + 91 + 534 + 36 + 2 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 882802944 + 21032540676 = 29712^2 + 145026^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

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 23 ways as a sum of consecutive naturals, for example, 3577879 + ... + 3583998.

It is an arithmetic number, because the mean of its divisors is an integer number (977596347).

Almost surely, 2^21915343620 is an apocalyptic number.

21915343620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21915343620 is an abundant number, since it is smaller than the sum of its proper divisors (48471593364).

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

21915343620 is a wasteful number, since it uses less digits than its factorization.

21915343620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7161909 (or 7161904 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The spelling of 21915343620 in words is "twenty-one billion, nine hundred fifteen million, three hundred forty-three thousand, six hundred twenty".