202112222121 has 24 divisors (see below), whose sum is σ = 296392881096. Its totient is φ = 132691910400.

The previous prime is 202112222111. The next prime is 202112222287. The reversal of 202112222121 is 121222211202.

It is a happy number.

202112222121 is a `hidden beast` number, since 20 + 211 + 222 + 212 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 39752384400 + 162359837721 = 199380^2 + 402939^2 .

It is not a de Polignac number, because 202112222121 - 2¹⁰ = 202112221097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202112222094 and 202112222103.

It is not an unprimeable number, because it can be changed into a prime (202112222111) 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, 193471 + ... + 664571.

It is an arithmetic number, because the mean of its divisors is an integer number (12349703379).

Almost surely, 2^202112222121 is an apocalyptic number.

It is an amenable number.

202112222121 is a deficient number, since it is larger than the sum of its proper divisors (94280658975).

202112222121 is a wasteful number, since it uses less digits than its factorization.

202112222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471833 (or 471830 counting only the distinct ones).

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

Adding to 202112222121 its reverse (121222211202), we get a palindrome (323334433323).

The spelling of 202112222121 in words is "two hundred two billion, one hundred twelve million, two hundred twenty-two thousand, one hundred twenty-one".