222111121221221 has 4 divisors (see below), whose sum is σ = 222113441475744. Its totient is φ = 222108800966700.

The previous prime is 222111121221211. The next prime is 222111121221259. The reversal of 222111121221221 is 122122121111222.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 222111121221221 - 2³⁴ = 222093941352037 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 (222111121221211) 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, 1159983665 + ... + 1160175126.

It is an arithmetic number, because the mean of its divisors is an integer number (55528360368936).

Almost surely, 2^{222111121221221} is an apocalyptic number.

It is an amenable number.

222111121221221 is a deficient number, since it is larger than the sum of its proper divisors (2320254523).

222111121221221 is an equidigital number, since it uses as much as digits as its factorization.

222111121221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2320254522.

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

Adding to 222111121221221 its reverse (122122121111222), we get a palindrome (344233242332443).

The spelling of 222111121221221 in words is "two hundred twenty-two trillion, one hundred eleven billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".