202012221221 has 2 divisors, whose sum is σ = 202012221222. Its totient is φ = 202012221220.

The previous prime is 202012221209. The next prime is 202012221233. The reversal of 202012221221 is 122122210202.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (202012221209) and next prime (202012221233).

It can be written as a sum of positive squares in only one way, i.e., 130094390596 + 71917830625 = 360686^2 + 268175^2 .

It is a cyclic number.

It is not a de Polignac number, because 202012221221 - 2¹⁰ = 202012220197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202012221221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202014221221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101006110610 + 101006110611.

It is an arithmetic number, because the mean of its divisors is an integer number (101006110611).

Almost surely, 2^202012221221 is an apocalyptic number.

It is an amenable number.

202012221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

202012221221 is an equidigital number, since it uses as much as digits as its factorization.

202012221221 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 202012221221 its reverse (122122210202), we get a palindrome (324134431423).

It can be divided in two parts, 20201 and 2221221, that added together give a palindrome (2241422).

The spelling of 202012221221 in words is "two hundred two billion, twelve million, two hundred twenty-one thousand, two hundred twenty-one".