21495522 has 16 divisors (see below), whose sum is σ = 43218432. Its totient is φ = 7127280.

The previous prime is 21495503. The next prime is 21495541. The reversal of 21495522 is 22559412.

It is an interprime number because it is at equal distance from previous prime (21495503) and next prime (21495541).

It is a self number, because there is not a number n which added to its sum of digits gives 21495522.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8233 + ... + 10524.

It is an arithmetic number, because the mean of its divisors is an integer number (2701152).

Almost surely, 2^21495522 is an apocalyptic number.

21495522 is an abundant number, since it is smaller than the sum of its proper divisors (21722910).

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

21495522 is a wasteful number, since it uses less digits than its factorization.

21495522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18953.

The product of its digits is 7200, while the sum is 30.

The square root of 21495522 is about 4636.3263474436. The cubic root of 21495522 is about 278.0455819535.

The spelling of 21495522 in words is "twenty-one million, four hundred ninety-five thousand, five hundred twenty-two".