21054760 has 32 divisors (see below), whose sum is σ = 48155400. Its totient is φ = 8282880.

The previous prime is 21054757. The next prime is 21054773. The reversal of 21054760 is 6745012.

It can be written as a sum of positive squares in 4 ways, for example, as 13883076 + 7171684 = 3726^2 + 2678^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1875 + ... + 6754.

Almost surely, 2^21054760 is an apocalyptic number.

21054760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21054760 is an abundant number, since it is smaller than the sum of its proper divisors (27100640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21054760 is a wasteful number, since it uses less digits than its factorization.

21054760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8701 (or 8697 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 21054760 is about 4588.5466108562. The cubic root of 21054760 is about 276.1320169385.

Adding to 21054760 its reverse (6745012), we get a palindrome (27799772).

The spelling of 21054760 in words is "twenty-one million, fifty-four thousand, seven hundred sixty".