21477484 has 18 divisors (see below), whose sum is σ = 43722420. Its totient is φ = 9204552.

The previous prime is 21477461. The next prime is 21477497. The reversal of 21477484 is 48477412.

It is a super-2 number, since 2×21477484² = 922564637940512, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54594 + ... + 54985.

Almost surely, 2^21477484 is an apocalyptic number.

It is an amenable number.

21477484 is an abundant number, since it is smaller than the sum of its proper divisors (22244936).

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

21477484 is a wasteful number, since it uses less digits than its factorization.

21477484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109597 (or 109588 counting only the distinct ones).

The product of its digits is 50176, while the sum is 37.

The square root of 21477484 is about 4634.3806490188. The cubic root of 21477484 is about 277.9677860642.

The spelling of 21477484 in words is "twenty-one million, four hundred seventy-seven thousand, four hundred eighty-four".