21125892 has 12 divisors (see below), whose sum is σ = 49293776. Its totient is φ = 7041960.

The previous prime is 21125887. The next prime is 21125933. The reversal of 21125892 is 29852112.

It is a tau number, because it is divible by the number of its divisors (12).

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, 880234 + ... + 880257.

Almost surely, 2^21125892 is an apocalyptic number.

It is an amenable number.

21125892 is an abundant number, since it is smaller than the sum of its proper divisors (28167884).

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

21125892 is a wasteful number, since it uses less digits than its factorization.

21125892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1760498 (or 1760496 counting only the distinct ones).

The product of its digits is 2880, while the sum is 30.

The square root of 21125892 is about 4596.2911134957. The cubic root of 21125892 is about 276.4426314908.

The spelling of 21125892 in words is "twenty-one million, one hundred twenty-five thousand, eight hundred ninety-two".