21334528 has 20 divisors (see below), whose sum is σ = 42628410. Its totient is φ = 10667008.

The previous prime is 21334499. The next prime is 21334559. The reversal of 21334528 is 82543312.

It can be written as a sum of positive squares in only one way, i.e., 20502784 + 831744 = 4528^2 + 912^2 .

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21334496 and 21334505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20323 + ... + 21346.

Almost surely, 2^21334528 is an apocalyptic number.

It is an amenable number.

21334528 is a deficient number, since it is larger than the sum of its proper divisors (21293882).

21334528 is an frugal number, since it uses more digits than its factorization.

21334528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41687 (or 41671 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 21334528 is about 4618.9314781668. The cubic root of 21334528 is about 277.3496867411.

The spelling of 21334528 in words is "twenty-one million, three hundred thirty-four thousand, five hundred twenty-eight".