201212222121 has 8 divisors (see below), whose sum is σ = 298092180960. Its totient is φ = 134141481396.

The previous prime is 201212222117. The next prime is 201212222131. The reversal of 201212222121 is 121222212102.

It is a happy number.

It is not a de Polignac number, because 201212222121 - 2² = 201212222117 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 201212222094 and 201212222103.

It is not an unprimeable number, because it can be changed into a prime (201212222111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3726152235 + ... + 3726152288.

It is an arithmetic number, because the mean of its divisors is an integer number (37261522620).

Almost surely, 2^201212222121 is an apocalyptic number.

It is an amenable number.

201212222121 is a deficient number, since it is larger than the sum of its proper divisors (96879958839).

201212222121 is an equidigital number, since it uses as much as digits as its factorization.

201212222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7452304532 (or 7452304526 counting only the distinct ones).

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

Adding to 201212222121 its reverse (121222212102), we get a palindrome (322434434223).

The spelling of 201212222121 in words is "two hundred one billion, two hundred twelve million, two hundred twenty-two thousand, one hundred twenty-one".