21449968 has 20 divisors (see below), whose sum is σ = 41828920. Its totient is φ = 10655424.

The previous prime is 21449959. The next prime is 21450019. The reversal of 21449968 is 86994412.

It is a super-2 number, since 2×21449968² = 920202254402048, which contains 22 as substring.

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, 1758 + ... + 6781.

It is an arithmetic number, because the mean of its divisors is an integer number (2091446).

Almost surely, 2^21449968 is an apocalyptic number.

It is an amenable number.

21449968 is a deficient number, since it is larger than the sum of its proper divisors (20378952).

21449968 is a wasteful number, since it uses less digits than its factorization.

21449968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8704 (or 8698 counting only the distinct ones).

The product of its digits is 124416, while the sum is 43.

The square root of 21449968 is about 4631.4110160943. The cubic root of 21449968 is about 277.8490286675.

The spelling of 21449968 in words is "twenty-one million, four hundred forty-nine thousand, nine hundred sixty-eight".