21022112228 has 24 divisors (see below), whose sum is σ = 39870959352. Its totient is φ = 9640710144.

The previous prime is 21022112227. The next prime is 21022112249. The reversal of 21022112228 is 82221122012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1366633024 + 19655479204 = 36968^2 + 140198^2 .

It is not an unprimeable number, because it can be changed into a prime (21022112227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1279325 + ... + 1295652.

It is an arithmetic number, because the mean of its divisors is an integer number (1661289973).

Almost surely, 2^21022112228 is an apocalyptic number.

It is an amenable number.

21022112228 is a deficient number, since it is larger than the sum of its proper divisors (18848847124).

21022112228 is a wasteful number, since it uses less digits than its factorization.

21022112228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575151 (or 2575149 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The spelling of 21022112228 in words is "twenty-one billion, twenty-two million, one hundred twelve thousand, two hundred twenty-eight".