222100121 has 12 divisors (see below), whose sum is σ = 245843892. Its totient is φ = 199938816.

The previous prime is 222100103. The next prime is 222100127. The reversal of 222100121 is 121001222.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 193627225 + 28472896 = 13915^2 + 5336^2 .

It is not a de Polignac number, because 222100121 - 2²² = 217905817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222100127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3356 + ... + 21341.

It is an arithmetic number, because the mean of its divisors is an integer number (20486991).

Almost surely, 2^222100121 is an apocalyptic number.

It is an amenable number.

222100121 is a deficient number, since it is larger than the sum of its proper divisors (23743771).

222100121 is a wasteful number, since it uses less digits than its factorization.

222100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24760 (or 24737 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 222100121 is about 14903.0238877887. The cubic root of 222100121 is about 605.5959076303.

Adding to 222100121 its reverse (121001222), we get a palindrome (343101343).

The spelling of 222100121 in words is "two hundred twenty-two million, one hundred thousand, one hundred twenty-one".