222222200121 has 12 divisors (see below), whose sum is σ = 321005711572. Its totient is φ = 148139784576.

The previous prime is 222222200093. The next prime is 222222200143. The reversal of 222222200121 is 121002222222.

222222200121 is a `hidden beast` number, since 222 + 222 + 200 + 1 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 145526990400 + 76695209721 = 381480^2 + 276939^2 .

It is not a de Polignac number, because 222222200121 - 2⁵ = 222222200089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222222200094 and 222222200103.

It is not an unprimeable number, because it can be changed into a prime (222222400121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 524956 + ... + 848541.

Almost surely, 2^222222200121 is an apocalyptic number.

It is an amenable number.

222222200121 is a deficient number, since it is larger than the sum of its proper divisors (98783511451).

222222200121 is a wasteful number, since it uses less digits than its factorization.

222222200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391480 (or 1391477 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 222222200121 its reverse (121002222222), we get a palindrome (343224422343).

The spelling of 222222200121 in words is "two hundred twenty-two billion, two hundred twenty-two million, two hundred thousand, one hundred twenty-one".