21522902 has 4 divisors (see below), whose sum is σ = 32284356. Its totient is φ = 10761450.

The previous prime is 21522889. The next prime is 21522911. The reversal of 21522902 is 20922512.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5380724 + ... + 5380727.

It is an arithmetic number, because the mean of its divisors is an integer number (8071089).

Almost surely, 2^21522902 is an apocalyptic number.

21522902 is a deficient number, since it is larger than the sum of its proper divisors (10761454).

21522902 is a wasteful number, since it uses less digits than its factorization.

21522902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10761453.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 21522902 is about 4639.2781766133. The cubic root of 21522902 is about 278.1635857251.

The spelling of 21522902 in words is "twenty-one million, five hundred twenty-two thousand, nine hundred two".