202222212121 has 2 divisors, whose sum is σ = 202222212122. Its totient is φ = 202222212120.

The previous prime is 202222212119. The next prime is 202222212151. The reversal of 202222212121 is 121212222202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140579253721 + 61642958400 = 374939^2 + 248280^2 .

It is a cyclic number.

It is not a de Polignac number, because 202222212121 - 2¹ = 202222212119 is a prime.

It is a super-2 number, since 2×202222212121² (a number of 23 digits) contains 22 as substring.

Together with 202222212119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (202222212151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101111106060 + 101111106061.

It is an arithmetic number, because the mean of its divisors is an integer number (101111106061).

Almost surely, 2^202222212121 is an apocalyptic number.

It is an amenable number.

202222212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

202222212121 is an equidigital number, since it uses as much as digits as its factorization.

202222212121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 202222212121 its reverse (121212222202), we get a palindrome (323434434323).

The spelling of 202222212121 in words is "two hundred two billion, two hundred twenty-two million, two hundred twelve thousand, one hundred twenty-one".