21092538 has 32 divisors (see below), whose sum is σ = 43476480. Its totient is φ = 6819120.

The previous prime is 21092507. The next prime is 21092543. The reversal of 21092538 is 83529012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28173 + ... + 28911.

It is an arithmetic number, because the mean of its divisors is an integer number (1358640).

Almost surely, 2^21092538 is an apocalyptic number.

21092538 is an abundant number, since it is smaller than the sum of its proper divisors (22383942).

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

21092538 is a wasteful number, since it uses less digits than its factorization.

21092538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 21092538 is about 4592.6613199756. The cubic root of 21092538 is about 276.2970703901.

The spelling of 21092538 in words is "twenty-one million, ninety-two thousand, five hundred thirty-eight".