112221221211221 has 4 divisors (see below), whose sum is σ = 112227543907500. Its totient is φ = 112214898514944.

The previous prime is 112221221211191. The next prime is 112221221211251. The reversal of 112221221211221 is 122112122122211.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (112221221211191) and next prime (112221221211251).

It can be written as a sum of positive squares in 2 ways, for example, as 10817428908196 + 101403792303025 = 3288986^2 + 10069945^2 .

It is a cyclic number.

It is not a de Polignac number, because 112221221211221 - 2³⁴ = 112204041342037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (112221221211251) 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, 3161321516 + ... + 3161357013.

It is an arithmetic number, because the mean of its divisors is an integer number (28056885976875).

Almost surely, 2^{112221221211221} is an apocalyptic number.

It is an amenable number.

112221221211221 is a deficient number, since it is larger than the sum of its proper divisors (6322696279).

112221221211221 is an equidigital number, since it uses as much as digits as its factorization.

112221221211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6322696278.

The product of its digits is 256, while the sum is 23.

Adding to 112221221211221 its reverse (122112122122211), we get a palindrome (234333343333432).

The spelling of 112221221211221 in words is "one hundred twelve trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred eleven thousand, two hundred twenty-one".