21054532 has 12 divisors (see below), whose sum is σ = 36983296. Its totient is φ = 10487880.

The previous prime is 21054521. The next prime is 21054533. The reversal of 21054532 is 23545012.

It is not an unprimeable number, because it can be changed into a prime (21054533) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 8628 + ... + 10795.

Almost surely, 2^21054532 is an apocalyptic number.

It is an amenable number.

21054532 is a deficient number, since it is larger than the sum of its proper divisors (15928764).

21054532 is a wasteful number, since it uses less digits than its factorization.

21054532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19698 (or 19696 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 21054532 is about 4588.5217663208. The cubic root of 21054532 is about 276.1310201991.

Adding to 21054532 its reverse (23545012), we get a palindrome (44599544).

The spelling of 21054532 in words is "twenty-one million, fifty-four thousand, five hundred thirty-two".