21037620940 has 24 divisors (see below), whose sum is σ = 50490290592. Its totient is φ = 7212898560.

The previous prime is 21037620931. The next prime is 21037620959. The reversal of 21037620940 is 4902673012.

It is a junction number, because it is equal to n+sod(n) for n = 21037620896 and 21037620905.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75134221 + ... + 75134500.

It is an arithmetic number, because the mean of its divisors is an integer number (2103762108).

Almost surely, 2^21037620940 is an apocalyptic number.

21037620940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21037620940 is an abundant number, since it is smaller than the sum of its proper divisors (29452669652).

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

21037620940 is a wasteful number, since it uses less digits than its factorization.

21037620940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150268737 (or 150268735 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The spelling of 21037620940 in words is "twenty-one billion, thirty-seven million, six hundred twenty thousand, nine hundred forty".