21223112 has 16 divisors (see below), whose sum is σ = 41523840. Its totient is φ = 10150096.

The previous prime is 21223093. The next prime is 21223141. The reversal of 21223112 is 21132212.

It is a happy 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, 57488 + ... + 57855.

It is an arithmetic number, because the mean of its divisors is an integer number (2595240).

Almost surely, 2^21223112 is an apocalyptic number.

It is an amenable number.

21223112 is a deficient number, since it is larger than the sum of its proper divisors (20300728).

21223112 is a wasteful number, since it uses less digits than its factorization.

21223112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115372 (or 115368 counting only the distinct ones).

The product of its digits is 48, while the sum is 14.

The square root of 21223112 is about 4606.8548924402. The cubic root of 21223112 is about 276.8660397408.

Adding to 21223112 its reverse (21132212), we get a palindrome (42355324).

The spelling of 21223112 in words is "twenty-one million, two hundred twenty-three thousand, one hundred twelve".