22122200221 has 6 divisors (see below), whose sum is σ = 24316137566. Its totient is φ = 20111091000.

The previous prime is 22122200201. The next prime is 22122200227. The reversal of 22122200221 is 12200222122.

It can be written as a sum of positive squares in only one way, i.e., 13531505625 + 8590694596 = 116325^2 + 92686^2 .

It is not a de Polignac number, because 22122200221 - 2¹¹ = 22122198173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22122200195 and 22122200204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22122200227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 91413930 + ... + 91414171.

Almost surely, 2^22122200221 is an apocalyptic number.

It is an amenable number.

22122200221 is a deficient number, since it is larger than the sum of its proper divisors (2193937345).

22122200221 is a wasteful number, since it uses less digits than its factorization.

22122200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182828123 (or 182828112 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 22122200221 its reverse (12200222122), we get a palindrome (34322422343).

The spelling of 22122200221 in words is "twenty-two billion, one hundred twenty-two million, two hundred thousand, two hundred twenty-one".