21842562 has 32 divisors (see below), whose sum is σ = 50067072. Its totient is φ = 6223104.

The previous prime is 21842551. The next prime is 21842573. The reversal of 21842562 is 26524812.

It is an interprime number because it is at equal distance from previous prime (21842551) and next prime (21842573).

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, 24468 + ... + 25344.

It is an arithmetic number, because the mean of its divisors is an integer number (1564596).

Almost surely, 2^21842562 is an apocalyptic number.

21842562 is an abundant number, since it is smaller than the sum of its proper divisors (28224510).

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

21842562 is a wasteful number, since it uses less digits than its factorization.

21842562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482.

The product of its digits is 7680, while the sum is 30.

The square root of 21842562 is about 4673.6026788763. The cubic root of 21842562 is about 279.5339270113.

The spelling of 21842562 in words is "twenty-one million, eight hundred forty-two thousand, five hundred sixty-two".