21352568 has 16 divisors (see below), whose sum is σ = 40097160. Its totient is φ = 10660000.

The previous prime is 21352559. The next prime is 21352571. The reversal of 21352568 is 86525312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4943 + ... + 8193.

Almost surely, 2^21352568 is an apocalyptic number.

It is an amenable number.

21352568 is a deficient number, since it is larger than the sum of its proper divisors (18744592).

21352568 is a wasteful number, since it uses less digits than its factorization.

21352568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4078 (or 4074 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The square root of 21352568 is about 4620.8838981303. The cubic root of 21352568 is about 277.4278382828.

The spelling of 21352568 in words is "twenty-one million, three hundred fifty-two thousand, five hundred sixty-eight".