222111121221021 has 4 divisors (see below), whose sum is σ = 296148161628032. Its totient is φ = 148074080814012.

The previous prime is 222111121220953. The next prime is 222111121221023. The reversal of 222111121221021 is 120122121111222.

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 not a de Polignac number, because 222111121221021 - 2⁹ = 222111121220509 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 (222111121221023) 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, 37018520203501 + ... + 37018520203506.

It is an arithmetic number, because the mean of its divisors is an integer number (74037040407008).

Almost surely, 2^{222111121221021} is an apocalyptic number.

It is an amenable number.

222111121221021 is a deficient number, since it is larger than the sum of its proper divisors (74037040407011).

222111121221021 is an equidigital number, since it uses as much as digits as its factorization.

222111121221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74037040407010.

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

Adding to 222111121221021 its reverse (120122121111222), we get a palindrome (342233242332243).

The spelling of 222111121221021 in words is "two hundred twenty-two trillion, one hundred eleven billion, one hundred twenty-one million, two hundred twenty-one thousand, twenty-one".