21339634 has 16 divisors (see below), whose sum is σ = 32719968. Its totient is φ = 10435392.

The previous prime is 21339629. The next prime is 21339649. The reversal of 21339634 is 43693312.

It is a junction number, because it is equal to n+sod(n) for n = 21339596 and 21339605.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21354 + ... + 22330.

It is an arithmetic number, because the mean of its divisors is an integer number (2044998).

Almost surely, 2^21339634 is an apocalyptic number.

21339634 is a deficient number, since it is larger than the sum of its proper divisors (11380334).

21339634 is a wasteful number, since it uses less digits than its factorization.

21339634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209.

The product of its digits is 11664, while the sum is 31.

The square root of 21339634 is about 4619.4841703376. The cubic root of 21339634 is about 277.3718110419.

The spelling of 21339634 in words is "twenty-one million, three hundred thirty-nine thousand, six hundred thirty-four".