222121121111111 has 4 divisors (see below), whose sum is σ = 224411029576272. Its totient is φ = 219831212645952.

The previous prime is 222121121111083. The next prime is 222121121111159. The reversal of 222121121111111 is 111111121121222.

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 222121121111111 - 2¹⁰ = 222121121110087 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 (222121121191111) 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, 1144954232435 + ... + 1144954232628.

It is an arithmetic number, because the mean of its divisors is an integer number (56102757394068).

Almost surely, 2^{222121121111111} is an apocalyptic number.

222121121111111 is a deficient number, since it is larger than the sum of its proper divisors (2289908465161).

222121121111111 is an equidigital number, since it uses as much as digits as its factorization.

222121121111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2289908465160.

The product of its digits is 32, while the sum is 20.

Adding to 222121121111111 its reverse (111111121121222), we get a palindrome (333232242232333).

It can be divided in two parts, 222121121111 and 111, that added together give a palindrome (222121121222).

The spelling of 222121121111111 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, one hundred twenty-one million, one hundred eleven thousand, one hundred eleven".