22121311221 has 8 divisors (see below), whose sum is σ = 32772312960. Its totient is φ = 14747540796.

The previous prime is 22121311213. The next prime is 22121311301. The reversal of 22121311221 is 12211312122.

22121311221 is a `hidden beast` number, since 221 + 213 + 11 + 221 = 666.

It is not a de Polignac number, because 22121311221 - 2³ = 22121311213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22121311194 and 22121311203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121311021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 409653885 + ... + 409653938.

It is an arithmetic number, because the mean of its divisors is an integer number (4096539120).

Almost surely, 2^22121311221 is an apocalyptic number.

It is an amenable number.

22121311221 is a deficient number, since it is larger than the sum of its proper divisors (10651001739).

22121311221 is an equidigital number, since it uses as much as digits as its factorization.

22121311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819307832 (or 819307826 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 22121311221 its reverse (12211312122), we get a palindrome (34332623343).

Subtracting from 22121311221 its reverse (12211312122), we obtain a palindrome (9909999099).

The spelling of 22121311221 in words is "twenty-two billion, one hundred twenty-one million, three hundred eleven thousand, two hundred twenty-one".