21622015620 has 72 divisors (see below), whose sum is σ = 65729303640. Its totient is φ = 5753341440.

The previous prime is 21622015609. The next prime is 21622015621. The reversal of 21622015620 is 2651022612.

21622015620 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 20 + 15 + 620 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 665856 + 21621349764 = 816^2 + 147042^2 .

It is not an unprimeable number, because it can be changed into a prime (21622015621) by changing a digit.

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, 47305 + ... + 213264.

It is an arithmetic number, because the mean of its divisors is an integer number (912906995).

Almost surely, 2^21622015620 is an apocalyptic number.

21622015620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21622015620 is an abundant number, since it is smaller than the sum of its proper divisors (44107288020).

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

21622015620 is a wasteful number, since it uses less digits than its factorization.

21622015620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261045 (or 261040 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 21622015620 in words is "twenty-one billion, six hundred twenty-two million, fifteen thousand, six hundred twenty".