21907339 has 16 divisors (see below), whose sum is σ = 24786432. Its totient is φ = 19248768.

The previous prime is 21907307. The next prime is 21907351. The reversal of 21907339 is 93370912.

It is a cyclic number.

It is not a de Polignac number, because 21907339 - 2⁵ = 21907307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21902339) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 16162 + ... + 17464.

It is an arithmetic number, because the mean of its divisors is an integer number (1549152).

Almost surely, 2^21907339 is an apocalyptic number.

21907339 is a deficient number, since it is larger than the sum of its proper divisors (2879093).

21907339 is a wasteful number, since it uses less digits than its factorization.

21907339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 21907339 is about 4680.5276411960. The cubic root of 21907339 is about 279.8099858773.

The spelling of 21907339 in words is "twenty-one million, nine hundred seven thousand, three hundred thirty-nine".