21735712 has 24 divisors (see below), whose sum is σ = 44174592. Its totient is φ = 10516800.

The previous prime is 21735709. The next prime is 21735719. The reversal of 21735712 is 21753712.

It is a super-3 number, since 3×21735712³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21735719) 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, 9964 + ... + 11947.

It is an arithmetic number, because the mean of its divisors is an integer number (1840608).

Almost surely, 2^21735712 is an apocalyptic number.

It is an amenable number.

21735712 is an abundant number, since it is smaller than the sum of its proper divisors (22438880).

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

21735712 is a wasteful number, since it uses less digits than its factorization.

21735712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21952 (or 21944 counting only the distinct ones).

The product of its digits is 2940, while the sum is 28.

The square root of 21735712 is about 4662.1574404990. The cubic root of 21735712 is about 279.0773713466.

The spelling of 21735712 in words is "twenty-one million, seven hundred thirty-five thousand, seven hundred twelve".