22122100021 has 6 divisors (see below), whose sum is σ = 25733871510. Its totient is φ = 18961799976.

The previous prime is 22122099977. The next prime is 22122100027. The reversal of 22122100021 is 12000122122.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18242554225 + 3879545796 = 135065^2 + 62286^2 .

It is not a de Polignac number, because 22122100021 - 2³¹ = 19974616373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22122099974 and 22122100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22122100027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 225735666 + ... + 225735763.

It is an arithmetic number, because the mean of its divisors is an integer number (4288978585).

Almost surely, 2^22122100021 is an apocalyptic number.

It is an amenable number.

22122100021 is a deficient number, since it is larger than the sum of its proper divisors (3611771489).

22122100021 is an equidigital number, since it uses as much as digits as its factorization.

22122100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451471443 (or 451471436 counting only the distinct ones).

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

Adding to 22122100021 its reverse (12000122122), we get a palindrome (34122222143).

The spelling of 22122100021 in words is "twenty-two billion, one hundred twenty-two million, one hundred thousand, twenty-one".