21132244 has 12 divisors (see below), whose sum is σ = 42264544. Its totient is φ = 9056664.

The previous prime is 21132233. The next prime is 21132257. The reversal of 21132244 is 44223112.

21132244 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377334 + ... + 377389.

Almost surely, 2^21132244 is an apocalyptic number.

It is an amenable number.

21132244 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21132244 is a wasteful number, since it uses less digits than its factorization.

21132244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754734 (or 754732 counting only the distinct ones).

The product of its digits is 384, while the sum is 19.

The square root of 21132244 is about 4596.9820534781. The cubic root of 21132244 is about 276.4703350569.

Adding to 21132244 its reverse (44223112), we get a palindrome (65355356).

The spelling of 21132244 in words is "twenty-one million, one hundred thirty-two thousand, two hundred forty-four".