21028892 has 24 divisors (see below), whose sum is σ = 38054016. Its totient is φ = 10161648.

The previous prime is 21028883. The next prime is 21028897. The reversal of 21028892 is 29882012.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21028897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17123 + ... + 18309.

It is an arithmetic number, because the mean of its divisors is an integer number (1585584).

Almost surely, 2^21028892 is an apocalyptic number.

It is an amenable number.

21028892 is a deficient number, since it is larger than the sum of its proper divisors (17025124).

21028892 is a wasteful number, since it uses less digits than its factorization.

21028892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337 (or 1335 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 21028892 is about 4585.7269870763. The cubic root of 21028892 is about 276.0188847962.

The spelling of 21028892 in words is "twenty-one million, twenty-eight thousand, eight hundred ninety-two".