22113211221 has 16 divisors (see below), whose sum is σ = 32764113600. Its totient is φ = 14740430544.

The previous prime is 22113211217. The next prime is 22113211229. The reversal of 22113211221 is 12211231122.

22113211221 is a `hidden beast` number, since 221 + 1 + 321 + 122 + 1 = 666.

It is not a de Polignac number, because 22113211221 - 2² = 22113211217 is a prime.

It is a super-2 number, since 2×22113211221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22113211194 and 22113211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22113211229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 216135 + ... + 301563.

It is an arithmetic number, because the mean of its divisors is an integer number (2047757100).

Almost surely, 2^22113211221 is an apocalyptic number.

It is an amenable number.

22113211221 is a deficient number, since it is larger than the sum of its proper divisors (10650902379).

22113211221 is an equidigital number, since it uses as much as digits as its factorization.

22113211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95025 (or 95019 counting only the distinct ones).

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

Adding to 22113211221 its reverse (12211231122), we get a palindrome (34324442343).

The spelling of 22113211221 in words is "twenty-two billion, one hundred thirteen million, two hundred eleven thousand, two hundred twenty-one".