21524522 has 4 divisors (see below), whose sum is σ = 32286786. Its totient is φ = 10762260.

The previous prime is 21524513. The next prime is 21524539. The reversal of 21524522 is 22542512.

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

It can be written as a sum of positive squares in only one way, i.e., 19704721 + 1819801 = 4439^2 + 1349^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5381129 + ... + 5381132.

Almost surely, 2^21524522 is an apocalyptic number.

21524522 is a deficient number, since it is larger than the sum of its proper divisors (10762264).

21524522 is a wasteful number, since it uses less digits than its factorization.

21524522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10762263.

The product of its digits is 1600, while the sum is 23.

The square root of 21524522 is about 4639.4527694546. The cubic root of 21524522 is about 278.1705645502.

The spelling of 21524522 in words is "twenty-one million, five hundred twenty-four thousand, five hundred twenty-two".