222121100111 has 4 divisors (see below), whose sum is σ = 222481102512. Its totient is φ = 221761097712.

The previous prime is 222121100081. The next prime is 222121100119. The reversal of 222121100111 is 111001121222.

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 222121100111 - 2¹⁰ = 222121099087 is a prime.

It is a super-2 number, since 2×222121100111² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222121100119) 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, 180000275 + ... + 180001508.

It is an arithmetic number, because the mean of its divisors is an integer number (55620275628).

Almost surely, 2^222121100111 is an apocalyptic number.

222121100111 is a deficient number, since it is larger than the sum of its proper divisors (360002401).

222121100111 is an equidigital number, since it uses as much as digits as its factorization.

222121100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360002400.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 222121100111 its reverse (111001121222), we get a palindrome (333122221333).

The spelling of 222121100111 in words is "two hundred twenty-two billion, one hundred twenty-one million, one hundred thousand, one hundred eleven".