21223132 has 24 divisors (see below), whose sum is σ = 43352064. Its totient is φ = 8901552.

The previous prime is 21223093. The next prime is 21223141. The reversal of 21223132 is 23132212.

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, 6748 + ... + 9379.

It is an arithmetic number, because the mean of its divisors is an integer number (1806336).

Almost surely, 2^21223132 is an apocalyptic number.

It is an amenable number.

21223132 is an abundant number, since it is smaller than the sum of its proper divisors (22128932).

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

21223132 is a wasteful number, since it uses less digits than its factorization.

21223132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16185 (or 16183 counting only the distinct ones).

The product of its digits is 144, while the sum is 16.

The square root of 21223132 is about 4606.8570631180. The cubic root of 21223132 is about 276.8661267108.

Adding to 21223132 its reverse (23132212), we get a palindrome (44355344).

The spelling of 21223132 in words is "twenty-one million, two hundred twenty-three thousand, one hundred thirty-two".