21339710 has 32 divisors (see below), whose sum is σ = 44651520. Its totient is φ = 7191072.

The previous prime is 21339677. The next prime is 21339733. The reversal of 21339710 is 1793312.

It is a self number, because there is not a number n which added to its sum of digits gives 21339710.

It is a congruent 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, 1547 + ... + 6713.

It is an arithmetic number, because the mean of its divisors is an integer number (1395360).

Almost surely, 2^21339710 is an apocalyptic number.

21339710 is an abundant number, since it is smaller than the sum of its proper divisors (23311810).

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

21339710 is a wasteful number, since it uses less digits than its factorization.

21339710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5240.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 21339710 is about 4619.4923963570. The cubic root of 21339710 is about 277.3721403232.

The spelling of 21339710 in words is "twenty-one million, three hundred thirty-nine thousand, seven hundred ten".