21472624 has 20 divisors (see below), whose sum is σ = 41724760. Its totient is φ = 10704960.

The previous prime is 21472621. The next prime is 21472631. The reversal of 21472624 is 42627412.

It is a happy number.

It is a super-2 number, since 2×21472624² = 922147162890752, which contains 22 as substring.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 21472592 and 21472601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21472621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4294 + ... + 7834.

It is an arithmetic number, because the mean of its divisors is an integer number (2086238).

Almost surely, 2^21472624 is an apocalyptic number.

It is an amenable number.

21472624 is a deficient number, since it is larger than the sum of its proper divisors (20252136).

21472624 is a wasteful number, since it uses less digits than its factorization.

21472624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3928 (or 3922 counting only the distinct ones).

The product of its digits is 5376, while the sum is 28.

The square root of 21472624 is about 4633.8562774432. The cubic root of 21472624 is about 277.9468179758.

The spelling of 21472624 in words is "twenty-one million, four hundred seventy-two thousand, six hundred twenty-four".