21222231328 has 24 divisors (see below), whose sum is σ = 41914774188. Its totient is φ = 10577209344.

The previous prime is 21222231319. The next prime is 21222231391. The reversal of 21222231328 is 82313222212.

It can be written as a sum of positive squares in 2 ways, for example, as 12694078224 + 8528153104 = 112668^2 + 92348^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21222231296 and 21222231305.

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, 1049401 + ... + 1069432.

Almost surely, 2^21222231328 is an apocalyptic number.

It is an amenable number.

21222231328 is a deficient number, since it is larger than the sum of its proper divisors (20692542860).

21222231328 is a wasteful number, since it uses less digits than its factorization.

21222231328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2119156 (or 2119148 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The spelling of 21222231328 in words is "twenty-one billion, two hundred twenty-two million, two hundred thirty-one thousand, three hundred twenty-eight".