222100222122121 has 6 divisors (see below), whose sum is σ = 258361482876810. Its totient is φ = 190371618961776.

The previous prime is 222100222122061. The next prime is 222100222122133. The reversal of 222100222122121 is 121221222001222.

It can be written as a sum of positive squares in only one way, i.e., 192284952889225 + 29815269232896 = 13866685^2 + 5460336^2 .

It is a de Polignac number, because none of the positive numbers 2^k-222100222122121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222100222122092 and 222100222122101.

It is not an unprimeable number, because it can be changed into a prime (222100222122151) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2266328797116 + ... + 2266328797213.

It is an arithmetic number, because the mean of its divisors is an integer number (43060247146135).

Almost surely, 2^{222100222122121} is an apocalyptic number.

It is an amenable number.

222100222122121 is a deficient number, since it is larger than the sum of its proper divisors (36261260754689).

222100222122121 is an equidigital number, since it uses as much as digits as its factorization.

222100222122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4532657594343 (or 4532657594336 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 222100222122121 its reverse (121221222001222), we get a palindrome (343321444123343).

The spelling of 222100222122121 in words is "two hundred twenty-two trillion, one hundred billion, two hundred twenty-two million, one hundred twenty-two thousand, one hundred twenty-one".