21054472 has 16 divisors (see below), whose sum is σ = 39595500. Its totient is φ = 10495680.

The previous prime is 21054457. The next prime is 21054521. The reversal of 21054472 is 27445012.

It can be written as a sum of positive squares in 2 ways, for example, as 20848356 + 206116 = 4566^2 + 454^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 979 + ... + 6562.

Almost surely, 2^21054472 is an apocalyptic number.

It is an amenable number.

21054472 is a deficient number, since it is larger than the sum of its proper divisors (18541028).

21054472 is a wasteful number, since it uses less digits than its factorization.

21054472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7896 (or 7892 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 21054472 is about 4588.5152282628. The cubic root of 21054472 is about 276.1307578981.

Adding to 21054472 its reverse (27445012), we get a palindrome (48499484).

The spelling of 21054472 in words is "twenty-one million, fifty-four thousand, four hundred seventy-two".