21348568 has 8 divisors (see below), whose sum is σ = 40028580. Its totient is φ = 10674280.

The previous prime is 21348557. The next prime is 21348581. The reversal of 21348568 is 86584312.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21348568² = 911522711301248, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1334278 + ... + 1334293.

Almost surely, 2^21348568 is an apocalyptic number.

It is an amenable number.

21348568 is a deficient number, since it is larger than the sum of its proper divisors (18680012).

21348568 is a wasteful number, since it uses less digits than its factorization.

21348568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2668577 (or 2668573 counting only the distinct ones).

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

The square root of 21348568 is about 4620.4510602321. The cubic root of 21348568 is about 277.4105135804.

The spelling of 21348568 in words is "twenty-one million, three hundred forty-eight thousand, five hundred sixty-eight".