122211111221 has 4 divisors (see below), whose sum is σ = 126425287500. Its totient is φ = 117996934944.

The previous prime is 122211111167. The next prime is 122211111227. The reversal of 122211111221 is 122111112221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122111112221 = 7 ⋅17444444603.

It can be written as a sum of positive squares in 2 ways, for example, as 104742202321 + 17468908900 = 323639^2 + 132170^2 .

It is a cyclic number.

It is not a de Polignac number, because 122211111221 - 2²² = 122206916917 is a prime.

It is a super-2 number, since 2×122211111221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 122211111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122211111227) 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, 2107088096 + ... + 2107088153.

It is an arithmetic number, because the mean of its divisors is an integer number (31606321875).

Almost surely, 2^122211111221 is an apocalyptic number.

It is an amenable number.

122211111221 is a deficient number, since it is larger than the sum of its proper divisors (4214176279).

122211111221 is an equidigital number, since it uses as much as digits as its factorization.

122211111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4214176278.

The product of its digits is 32, while the sum is 17.

Adding to 122211111221 its reverse (122111112221), we get a palindrome (244322223442).

It can be divided in two parts, 1 and 22211111221, that added together give a palindrome (22211111222).

The spelling of 122211111221 in words is "one hundred twenty-two billion, two hundred eleven million, one hundred eleven thousand, two hundred twenty-one".