202211211221 has 2 divisors, whose sum is σ = 202211211222. Its totient is φ = 202211211220.

The previous prime is 202211211211. The next prime is 202211211233. The reversal of 202211211221 is 122112112202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201703384996 + 507826225 = 449114^2 + 22535^2 .

It is a cyclic number.

It is not a de Polignac number, because 202211211221 - 2⁶ = 202211211157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202211211221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202211211211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101105605610 + 101105605611.

It is an arithmetic number, because the mean of its divisors is an integer number (101105605611).

Almost surely, 2^202211211221 is an apocalyptic number.

It is an amenable number.

202211211221 is a deficient number, since it is larger than the sum of its proper divisors (1).

202211211221 is an equidigital number, since it uses as much as digits as its factorization.

202211211221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 202211211221 its reverse (122112112202), we get a palindrome (324323323423).

The spelling of 202211211221 in words is "two hundred two billion, two hundred eleven million, two hundred eleven thousand, two hundred twenty-one".