22122111211221 has 96 divisors (see below), whose sum is σ = 35430800957440. Its totient is φ = 12025969160832.

The previous prime is 22122111211217. The next prime is 22122111211283. The reversal of 22122111211221 is 12211211122122.

It is not a de Polignac number, because 22122111211221 - 2² = 22122111211217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22122111211021) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3064425150 + ... + 3064432368.

Almost surely, 2^{22122111211221} is an apocalyptic number.

22122111211221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22122111211221 is a deficient number, since it is larger than the sum of its proper divisors (13308689746219).

22122111211221 is a wasteful number, since it uses less digits than its factorization.

22122111211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8735 (or 8712 counting only the distinct ones).

The product of its digits is 128, while the sum is 21.

Adding to 22122111211221 its reverse (12211211122122), we get a palindrome (34333322333343).

The spelling of 22122111211221 in words is "twenty-two trillion, one hundred twenty-two billion, one hundred eleven million, two hundred eleven thousand, two hundred twenty-one".