21873615625 has 24 divisors (see below), whose sum is σ = 27748598976. Its totient is φ = 17237550000.

The previous prime is 21873615541. The next prime is 21873615649. The reversal of 21873615625 is 52651637812.

It is not a de Polignac number, because 21873615625 - 2¹⁷ = 21873484553 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 157140 + ... + 261610.

It is an arithmetic number, because the mean of its divisors is an integer number (1156191624).

Almost surely, 2^21873615625 is an apocalyptic number.

21873615625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21873615625 is a deficient number, since it is larger than the sum of its proper divisors (5874983351).

21873615625 is an frugal number, since it uses more digits than its factorization.

21873615625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104563 (or 104543 counting only the distinct ones).

The product of its digits is 604800, while the sum is 46.

The spelling of 21873615625 in words is "twenty-one billion, eight hundred seventy-three million, six hundred fifteen thousand, six hundred twenty-five".