21712192 has 56 divisors (see below), whose sum is σ = 45345096. Its totient is φ = 10303488.

The previous prime is 21712169. The next prime is 21712211. The reversal of 21712192 is 29121712.

It can be written as a sum of positive squares in 4 ways, for example, as 14868736 + 6843456 = 3856^2 + 2616^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125418 + ... + 125590.

Almost surely, 2^21712192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21712192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22672548).

21712192 is an abundant number, since it is smaller than the sum of its proper divisors (23632904).

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

21712192 is a wasteful number, since it uses less digits than its factorization.

21712192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275 (or 265 counting only the distinct ones).

The product of its digits is 504, while the sum is 25.

The square root of 21712192 is about 4659.6343204161. The cubic root of 21712192 is about 278.9766727241.

It can be divided in two parts, 21712 and 192, that added together give a square (21904 = 148²).

The spelling of 21712192 in words is "twenty-one million, seven hundred twelve thousand, one hundred ninety-two".