202220121221 has 2 divisors, whose sum is σ = 202220121222. Its totient is φ = 202220121220.

The previous prime is 202220121217. The next prime is 202220121253. The reversal of 202220121221 is 122121022202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121003101025 + 81217020196 = 347855^2 + 284986^2 .

It is a cyclic number.

It is not a de Polignac number, because 202220121221 - 2² = 202220121217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202220121221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202220181221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101110060610 + 101110060611.

It is an arithmetic number, because the mean of its divisors is an integer number (101110060611).

Almost surely, 2^202220121221 is an apocalyptic number.

It is an amenable number.

202220121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

202220121221 is an equidigital number, since it uses as much as digits as its factorization.

202220121221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 202220121221 its reverse (122121022202), we get a palindrome (324341143423).

The spelling of 202220121221 in words is "two hundred two billion, two hundred twenty million, one hundred twenty-one thousand, two hundred twenty-one".