21159752 has 16 divisors (see below), whose sum is σ = 39788160. Its totient is φ = 10549584.

The previous prime is 21159751. The next prime is 21159757. The reversal of 21159752 is 25795112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21159751) 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, 668 + ... + 6539.

It is an arithmetic number, because the mean of its divisors is an integer number (2486760).

Almost surely, 2^21159752 is an apocalyptic number.

It is an amenable number.

21159752 is a deficient number, since it is larger than the sum of its proper divisors (18628408).

21159752 is a wasteful number, since it uses less digits than its factorization.

21159752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7580 (or 7576 counting only the distinct ones).

The product of its digits is 6300, while the sum is 32.

The square root of 21159752 is about 4599.9730433993. The cubic root of 21159752 is about 276.5902442104.

The spelling of 21159752 in words is "twenty-one million, one hundred fifty-nine thousand, seven hundred fifty-two".