21739084 has 6 divisors (see below), whose sum is σ = 38043404. Its totient is φ = 10869540.

The previous prime is 21739049. The next prime is 21739103. The reversal of 21739084 is 48093712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2717382 + ... + 2717389.

Almost surely, 2^21739084 is an apocalyptic number.

It is an amenable number.

21739084 is a deficient number, since it is larger than the sum of its proper divisors (16304320).

21739084 is a wasteful number, since it uses less digits than its factorization.

21739084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5434775 (or 5434773 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 21739084 is about 4662.5190616232. The cubic root of 21739084 is about 279.0918022862.

The spelling of 21739084 in words is "twenty-one million, seven hundred thirty-nine thousand, eighty-four".