21522768 has 40 divisors (see below), whose sum is σ = 55800000. Its totient is φ = 7148544.

The previous prime is 21522749. The next prime is 21522791. The reversal of 21522768 is 86722512.

It is a congruent number.

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, 16608 + ... + 17856.

It is an arithmetic number, because the mean of its divisors is an integer number (1395000).

Almost surely, 2^21522768 is an apocalyptic number.

It is an amenable number.

21522768 is an abundant number, since it is smaller than the sum of its proper divisors (34277232).

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

21522768 is a wasteful number, since it uses less digits than its factorization.

21522768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1619 (or 1613 counting only the distinct ones).

The product of its digits is 13440, while the sum is 33.

The square root of 21522768 is about 4639.2637346889. The cubic root of 21522768 is about 278.1630084486.

The spelling of 21522768 in words is "twenty-one million, five hundred twenty-two thousand, seven hundred sixty-eight".