21055132 has 12 divisors (see below), whose sum is σ = 42110320. Its totient is φ = 9023616.

The previous prime is 21055123. The next prime is 21055141. The reversal of 21055132 is 23155012.

It is an interprime number because it is at equal distance from previous prime (21055123) and next prime (21055141).

21055132 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375957 + ... + 376012.

Almost surely, 2^21055132 is an apocalyptic number.

It is an amenable number.

21055132 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21055132 is a wasteful number, since it uses less digits than its factorization.

21055132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751980 (or 751978 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 21055132 is about 4588.5871463883. The cubic root of 21055132 is about 276.1336431821.

The spelling of 21055132 in words is "twenty-one million, fifty-five thousand, one hundred thirty-two".