222222121021111 has 4 divisors (see below), whose sum is σ = 224422340041224. Its totient is φ = 220021902001000.

The previous prime is 222222121021097. The next prime is 222222121021129. The reversal of 222222121021111 is 111120121222222.

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

It is a cyclic number.

It is not a de Polignac number, because 222222121021111 - 2²⁹ = 222221584150199 is a prime.

It is a super-2 number, since 2×222222121021111² (a number of 29 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222222121021151) 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, 1100109509905 + ... + 1100109510106.

It is an arithmetic number, because the mean of its divisors is an integer number (56105585010306).

Almost surely, 2^{222222121021111} is an apocalyptic number.

222222121021111 is a deficient number, since it is larger than the sum of its proper divisors (2200219020113).

222222121021111 is a wasteful number, since it uses less digits than its factorization.

222222121021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2200219020112.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 222222121021111 its reverse (111120121222222), we get a palindrome (333342242243333).

The spelling of 222222121021111 in words is "two hundred twenty-two trillion, two hundred twenty-two billion, one hundred twenty-one million, twenty-one thousand, one hundred eleven".