21322522 has 32 divisors (see below), whose sum is σ = 38404800. Its totient is φ = 8771328.

The previous prime is 21322493. The next prime is 21322547. The reversal of 21322522 is 22522312.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21322522.

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, 7129 + ... + 9667.

It is an arithmetic number, because the mean of its divisors is an integer number (1200150).

Almost surely, 2^21322522 is an apocalyptic number.

21322522 is a deficient number, since it is larger than the sum of its proper divisors (17082278).

21322522 is a wasteful number, since it uses less digits than its factorization.

21322522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2590.

The product of its digits is 480, while the sum is 19.

The square root of 21322522 is about 4617.6316440357. The cubic root of 21322522 is about 277.2976508245.

Adding to 21322522 its reverse (22522312), we get a palindrome (43844834).

The spelling of 21322522 in words is "twenty-one million, three hundred twenty-two thousand, five hundred twenty-two".