21701892 has 12 divisors (see below), whose sum is σ = 50637776. Its totient is φ = 7233960.

The previous prime is 21701879. The next prime is 21701941. The reversal of 21701892 is 29810712.

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, 904234 + ... + 904257.

Almost surely, 2^21701892 is an apocalyptic number.

It is an amenable number.

21701892 is an abundant number, since it is smaller than the sum of its proper divisors (28935884).

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

21701892 is a wasteful number, since it uses less digits than its factorization.

21701892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808498 (or 1808496 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 21701892 is about 4658.5289523625. The cubic root of 21701892 is about 278.9325513655.

The spelling of 21701892 in words is "twenty-one million, seven hundred one thousand, eight hundred ninety-two".