222122012121 has 24 divisors (see below), whose sum is σ = 345285148104. Its totient is φ = 137085903360.

The previous prime is 222122012117. The next prime is 222122012137. The reversal of 222122012121 is 121210221222.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 25486526025 + 196635486096 = 159645^2 + 443436^2 .

It is not a de Polignac number, because 222122012121 - 2² = 222122012117 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 222122012094 and 222122012103.

It is not an unprimeable number, because it can be changed into a prime (222122017121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11890486 + ... + 11909151.

It is an arithmetic number, because the mean of its divisors is an integer number (14386881171).

Almost surely, 2^222122012121 is an apocalyptic number.

It is an amenable number.

222122012121 is a deficient number, since it is larger than the sum of its proper divisors (123163135983).

222122012121 is a wasteful number, since it uses less digits than its factorization.

222122012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23799721 (or 23799718 counting only the distinct ones).

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

Adding to 222122012121 its reverse (121210221222), we get a palindrome (343332233343).

The spelling of 222122012121 in words is "two hundred twenty-two billion, one hundred twenty-two million, twelve thousand, one hundred twenty-one".