21932228 has 12 divisors (see below), whose sum is σ = 38453520. Its totient is φ = 10945512.

The previous prime is 21932219. The next prime is 21932233. The reversal of 21932228 is 82223912.

It is a self number, because there is not a number n which added to its sum of digits gives 21932228.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2618 + ... + 7121.

It is an arithmetic number, because the mean of its divisors is an integer number (3204460).

Almost surely, 2^21932228 is an apocalyptic number.

It is an amenable number.

21932228 is a deficient number, since it is larger than the sum of its proper divisors (16521292).

21932228 is a wasteful number, since it uses less digits than its factorization.

21932228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10306 (or 10304 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 21932228 is about 4683.1856678974. The cubic root of 21932228 is about 279.9159101227.

The spelling of 21932228 in words is "twenty-one million, nine hundred thirty-two thousand, two hundred twenty-eight".