222111222222121 has 4 divisors (see below), whose sum is σ = 225239549295744. Its totient is φ = 218982895148500.

The previous prime is 222111222222091. The next prime is 222111222222199. The reversal of 222111222222121 is 121222222111222.

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 a de Polignac number, because none of the positive numbers 2^k-222111222222121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222111222232121) 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, 1564163536705 + ... + 1564163536846.

It is an arithmetic number, because the mean of its divisors is an integer number (56309887323936).

Almost surely, 2^{222111222222121} is an apocalyptic number.

It is an amenable number.

222111222222121 is a deficient number, since it is larger than the sum of its proper divisors (3128327073623).

222111222222121 is an equidigital number, since it uses as much as digits as its factorization.

222111222222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3128327073622.

The product of its digits is 1024, while the sum is 25.

Adding to 222111222222121 its reverse (121222222111222), we get a palindrome (343333444333343).

The spelling of 222111222222121 in words is "two hundred twenty-two trillion, one hundred eleven billion, two hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-one".