21022112 has 24 divisors (see below), whose sum is σ = 41674500. Its totient is φ = 10438144.

The previous prime is 21022103. The next prime is 21022117. The reversal of 21022112 is 21122012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16679056 + 4343056 = 4084^2 + 2084^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21022093 and 21022102.

It is not an unprimeable number, because it can be changed into a prime (21022117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2564 + ... + 6972.

Almost surely, 2^21022112 is an apocalyptic number.

It is an amenable number.

21022112 is a deficient number, since it is larger than the sum of its proper divisors (20652388).

21022112 is a wasteful number, since it uses less digits than its factorization.

21022112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4568 (or 4560 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 21022112 is about 4584.9876771917. The cubic root of 21022112 is about 275.9892175302.

Adding to 21022112 its reverse (21122012), we get a palindrome (42144124).

It can be divided in two parts, 210 and 22112, that added together give a palindrome (22322).

The spelling of 21022112 in words is "twenty-one million, twenty-two thousand, one hundred twelve".