21045768 has 32 divisors (see below), whose sum is σ = 55384800. Its totient is φ = 6645888.

The previous prime is 21045767. The next prime is 21045769. The reversal of 21045768 is 86754012.

It is an interprime number because it is at equal distance from previous prime (21045767) and next prime (21045769).

It is not an unprimeable number, because it can be changed into a prime (21045763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22621 + ... + 23532.

It is an arithmetic number, because the mean of its divisors is an integer number (1730775).

Almost surely, 2^21045768 is an apocalyptic number.

It is an amenable number.

21045768 is an abundant number, since it is smaller than the sum of its proper divisors (34339032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21045768 is a wasteful number, since it uses less digits than its factorization.

21045768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46181 (or 46177 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 21045768 is about 4587.5666752648. The cubic root of 21045768 is about 276.0927014796.

The spelling of 21045768 in words is "twenty-one million, forty-five thousand, seven hundred sixty-eight".