222201212121 has 20 divisors (see below), whose sum is σ = 379348807552. Its totient is φ = 126972120888.

The previous prime is 222201212117. The next prime is 222201212173. The reversal of 222201212121 is 121212102222.

It is a happy number.

It is not a de Polignac number, because 222201212121 - 2² = 222201212117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 222201212094 and 222201212103.

It is not an unprimeable number, because it can be changed into a prime (222201212111) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 195944065 + ... + 195945198.

Almost surely, 2^222201212121 is an apocalyptic number.

222201212121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

222201212121 is a deficient number, since it is larger than the sum of its proper divisors (157147595431).

222201212121 is an equidigital number, since it uses as much as digits as its factorization.

222201212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391889282 (or 391889273 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 222201212121 its reverse (121212102222), we get a palindrome (343413314343).

The spelling of 222201212121 in words is "two hundred twenty-two billion, two hundred one million, two hundred twelve thousand, one hundred twenty-one".