21482520 has 32 divisors (see below), whose sum is σ = 64447920. Its totient is φ = 5728640.

The previous prime is 21482519. The next prime is 21482557. The reversal of 21482520 is 2528412.

It is a super-2 number, since 2×21482520² = 922997331100800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89391 + ... + 89630.

Almost surely, 2^21482520 is an apocalyptic number.

21482520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21482520 is an abundant number, since it is smaller than the sum of its proper divisors (42965400).

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

21482520 is a wasteful number, since it uses less digits than its factorization.

21482520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179035 (or 179031 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 21482520 is about 4634.9239475961. The cubic root of 21482520 is about 277.9895101540.

The spelling of 21482520 in words is "twenty-one million, four hundred eighty-two thousand, five hundred twenty".