21875612 has 48 divisors (see below), whose sum is σ = 44513280. Its totient is φ = 9302400.

The previous prime is 21875611. The next prime is 21875629. The reversal of 21875612 is 21657812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21875611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114437 + ... + 114627.

It is an arithmetic number, because the mean of its divisors is an integer number (927360).

Almost surely, 2^21875612 is an apocalyptic number.

21875612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21875612 is an abundant number, since it is smaller than the sum of its proper divisors (22637668).

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

21875612 is a wasteful number, since it uses less digits than its factorization.

21875612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362 (or 360 counting only the distinct ones).

The product of its digits is 6720, while the sum is 32.

The square root of 21875612 is about 4677.1371585618. The cubic root of 21875612 is about 279.6748436394.

The spelling of 21875612 in words is "twenty-one million, eight hundred seventy-five thousand, six hundred twelve".