21882770 has 64 divisors (see below), whose sum is σ = 49109760. Its totient is φ = 6835968.

The previous prime is 21882739. The next prime is 21882781. The reversal of 21882770 is 7728812.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 21882770.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126404 + ... + 126576.

It is an arithmetic number, because the mean of its divisors is an integer number (767340).

Almost surely, 2^21882770 is an apocalyptic number.

21882770 is an abundant number, since it is smaller than the sum of its proper divisors (27226990).

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

21882770 is a wasteful number, since it uses less digits than its factorization.

21882770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 21882770 is about 4677.9023076589. The cubic root of 21882770 is about 279.7053447932.

The spelling of 21882770 in words is "twenty-one million, eight hundred eighty-two thousand, seven hundred seventy".