21907510020 has 384 divisors, whose sum is σ = 81452044800. Its totient is φ = 4825497600.

The previous prime is 21907510019. The next prime is 21907510057. The reversal of 21907510020 is 2001570912.

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

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 127 ways as a sum of consecutive naturals, for example, 2924680 + ... + 2932160.

It is an arithmetic number, because the mean of its divisors is an integer number (212114700).

Almost surely, 2^21907510020 is an apocalyptic number.

21907510020 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 21907510020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40726022400).

21907510020 is an abundant number, since it is smaller than the sum of its proper divisors (59544534780).

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

21907510020 is a wasteful number, since it uses less digits than its factorization.

21907510020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7556 (or 7548 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The spelling of 21907510020 in words is "twenty-one billion, nine hundred seven million, five hundred ten thousand, twenty".