21383624 has 16 divisors (see below), whose sum is σ = 40485120. Its totient is φ = 10587600.

The previous prime is 21383597. The next prime is 21383633. The reversal of 21383624 is 42638312.

It is a super-3 number, since 3×21383624³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12152 + ... + 13799.

It is an arithmetic number, because the mean of its divisors is an integer number (2530320).

Almost surely, 2^21383624 is an apocalyptic number.

It is an amenable number.

21383624 is a deficient number, since it is larger than the sum of its proper divisors (19101496).

21383624 is a wasteful number, since it uses less digits than its factorization.

21383624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26060 (or 26056 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 21383624 is about 4624.2430731959. The cubic root of 21383624 is about 277.5622737172.

The spelling of 21383624 in words is "twenty-one million, three hundred eighty-three thousand, six hundred twenty-four".