22112200021 has 4 divisors (see below), whose sum is σ = 22116263500. Its totient is φ = 22108136544.

The previous prime is 22112200001. The next prime is 22112200039. The reversal of 22112200021 is 12000221122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12000221122 = 2 ⋅6000110561.

It can be written as a sum of positive squares in 2 ways, for example, as 7200371025 + 14911828996 = 84855^2 + 122114^2 .

It is a cyclic number.

It is not a de Polignac number, because 22112200021 - 2⁹ = 22112199509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22112199974 and 22112200010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22112200001) 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, 2023566 + ... + 2034463.

It is an arithmetic number, because the mean of its divisors is an integer number (5529065875).

Almost surely, 2^22112200021 is an apocalyptic number.

It is an amenable number.

22112200021 is a deficient number, since it is larger than the sum of its proper divisors (4063479).

22112200021 is an equidigital number, since it uses as much as digits as its factorization.

22112200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4063478.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 22112200021 its reverse (12000221122), we get a palindrome (34112421143).

The spelling of 22112200021 in words is "twenty-two billion, one hundred twelve million, two hundred thousand, twenty-one".