21023168 has 28 divisors (see below), whose sum is σ = 41910000. Its totient is φ = 10463232.

The previous prime is 21023161. The next prime is 21023183. The reversal of 21023168 is 86132012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16208 + ... + 17456.

Almost surely, 2^21023168 is an apocalyptic number.

It is an amenable number.

21023168 is a deficient number, since it is larger than the sum of its proper divisors (20886832).

21023168 is a wasteful number, since it uses less digits than its factorization.

21023168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1524 (or 1514 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 21023168 is about 4585.1028341794. The cubic root of 21023168 is about 275.9938386918.

The spelling of 21023168 in words is "twenty-one million, twenty-three thousand, one hundred sixty-eight".