21916710 has 32 divisors (see below), whose sum is σ = 58445280. Its totient is φ = 5844384.

The previous prime is 21916669. The next prime is 21916753. The reversal of 21916710 is 1761912.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 40317 + ... + 40856.

It is an arithmetic number, because the mean of its divisors is an integer number (1826415).

Almost surely, 2^21916710 is an apocalyptic number.

21916710 is an abundant number, since it is smaller than the sum of its proper divisors (36528570).

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

21916710 is a wasteful number, since it uses less digits than its factorization.

21916710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81189 (or 81183 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 21916710 is about 4681.5285965163. The cubic root of 21916710 is about 279.8498770084.

The spelling of 21916710 in words is "twenty-one million, nine hundred sixteen thousand, seven hundred ten".