21384568 has 16 divisors (see below), whose sum is σ = 40194000. Its totient is φ = 10666176.

The previous prime is 21384533. The next prime is 21384613. The reversal of 21384568 is 86548312.

It is a happy number.

It is a congruent number.

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, 468 + ... + 6556.

It is an arithmetic number, because the mean of its divisors is an integer number (2512125).

Almost surely, 2^21384568 is an apocalyptic number.

It is an amenable number.

21384568 is a deficient number, since it is larger than the sum of its proper divisors (18809432).

21384568 is a wasteful number, since it uses less digits than its factorization.

21384568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6534 (or 6530 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 21384568 is about 4624.3451428283. The cubic root of 21384568 is about 277.5663580722.

It can be divided in two parts, 21384 and 568, that added together give a cube (21952 = 28³).

The spelling of 21384568 in words is "twenty-one million, three hundred eighty-four thousand, five hundred sixty-eight".