21463824 has 40 divisors (see below), whose sum is σ = 55864480. Its totient is φ = 7100928.

The previous prime is 21463801. The next prime is 21463831. The reversal of 21463824 is 42836412.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21463791 and 21463800.

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, 5064 + ... + 8280.

It is an arithmetic number, because the mean of its divisors is an integer number (1396612).

Almost surely, 2^21463824 is an apocalyptic number.

21463824 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21463824 is an abundant number, since it is smaller than the sum of its proper divisors (34400656).

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

21463824 is a wasteful number, since it uses less digits than its factorization.

21463824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3367 (or 3361 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

The square root of 21463824 is about 4632.9066470198. The cubic root of 21463824 is about 277.9088430143.

The spelling of 21463824 in words is "twenty-one million, four hundred sixty-three thousand, eight hundred twenty-four".