21149168 has 10 divisors (see below), whose sum is σ = 40976544. Its totient is φ = 10574576.

The previous prime is 21149131. The next prime is 21149171. The reversal of 21149168 is 86194112.

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, 660896 + ... + 660927.

Almost surely, 2^21149168 is an apocalyptic number.

It is an amenable number.

21149168 is a deficient number, since it is larger than the sum of its proper divisors (19827376).

21149168 is a wasteful number, since it uses less digits than its factorization.

21149168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321831 (or 1321825 counting only the distinct ones).

The product of its digits is 3456, while the sum is 32.

The square root of 21149168 is about 4598.8224579777. The cubic root of 21149168 is about 276.5441201762.

The spelling of 21149168 in words is "twenty-one million, one hundred forty-nine thousand, one hundred sixty-eight".