22111202221 has 4 divisors (see below), whose sum is σ = 22873657500. Its totient is φ = 21348746944.

The previous prime is 22111202219. The next prime is 22111202227. The reversal of 22111202221 is 12220211122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18464733225 + 3646468996 = 135885^2 + 60386^2 .

It is a cyclic number.

It is not a de Polignac number, because 22111202221 - 2¹ = 22111202219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22111202195 and 22111202204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22111202227) 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, 381227596 + ... + 381227653.

It is an arithmetic number, because the mean of its divisors is an integer number (5718414375).

Almost surely, 2^22111202221 is an apocalyptic number.

It is an amenable number.

22111202221 is a deficient number, since it is larger than the sum of its proper divisors (762455279).

22111202221 is an equidigital number, since it uses as much as digits as its factorization.

22111202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762455278.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22111202221 its reverse (12220211122), we get a palindrome (34331413343).

The spelling of 22111202221 in words is "twenty-two billion, one hundred eleven million, two hundred two thousand, two hundred twenty-one".