21345710 has 32 divisors (see below), whose sum is σ = 40914720. Its totient is φ = 7990272.

The previous prime is 21345703. The next prime is 21345713. The reversal of 21345710 is 1754312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21345713) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51986 + ... + 52394.

It is an arithmetic number, because the mean of its divisors is an integer number (1278585).

Almost surely, 2^21345710 is an apocalyptic number.

21345710 is a deficient number, since it is larger than the sum of its proper divisors (19569010).

21345710 is a wasteful number, since it uses less digits than its factorization.

21345710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 21345710 is about 4620.1417727165. The cubic root of 21345710 is about 277.3981337551.

The spelling of 21345710 in words is "twenty-one million, three hundred forty-five thousand, seven hundred ten".