21340710 has 48 divisors (see below), whose sum is σ = 57283200. Its totient is φ = 5506560.

The previous prime is 21340663. The next prime is 21340721. The reversal of 21340710 is 1704312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1035 + ... + 6614.

It is an arithmetic number, because the mean of its divisors is an integer number (1193400).

Almost surely, 2^21340710 is an apocalyptic number.

21340710 is an abundant number, since it is smaller than the sum of its proper divisors (35942490).

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

21340710 is a wasteful number, since it uses less digits than its factorization.

21340710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7693 (or 7690 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 21340710 is about 4619.6006320893. The cubic root of 21340710 is about 277.3764729002.

The spelling of 21340710 in words is "twenty-one million, three hundred forty thousand, seven hundred ten".