222111202121 has 4 divisors (see below), whose sum is σ = 222252585744. Its totient is φ = 221969818500.

The previous prime is 222111202091. The next prime is 222111202133. The reversal of 222111202121 is 121202111222.

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-222111202121 is a prime.

It is a super-2 number, since 2×222111202121² (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 222111202121.

It is not an unprimeable number, because it can be changed into a prime (222111202151) 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, 70689455 + ... + 70692596.

It is an arithmetic number, because the mean of its divisors is an integer number (55563146436).

Almost surely, 2^222111202121 is an apocalyptic number.

It is an amenable number.

222111202121 is a deficient number, since it is larger than the sum of its proper divisors (141383623).

222111202121 is a wasteful number, since it uses less digits than its factorization.

222111202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141383622.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 222111202121 its reverse (121202111222), we get a palindrome (343313313343).

The spelling of 222111202121 in words is "two hundred twenty-two billion, one hundred eleven million, two hundred two thousand, one hundred twenty-one".