202221021201221 has 6 divisors (see below), whose sum is σ = 222275998510566. Its totient is φ = 183837292001000.

The previous prime is 202221021201217. The next prime is 202221021201223. The reversal of 202221021201221 is 122102120122202.

It can be written as a sum of positive squares in only one way, i.e., 191671426257025 + 10549594944196 = 13844545^2 + 3248014^2 .

It is not a de Polignac number, because 202221021201221 - 2² = 202221021201217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202221021201193 and 202221021201202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202221021201223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 835624054430 + ... + 835624054671.

It is an arithmetic number, because the mean of its divisors is an integer number (37045999751761).

Almost surely, 2^{202221021201221} is an apocalyptic number.

It is an amenable number.

202221021201221 is a deficient number, since it is larger than the sum of its proper divisors (20054977309345).

202221021201221 is a wasteful number, since it uses less digits than its factorization.

202221021201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671248109123 (or 1671248109112 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 202221021201221 its reverse (122102120122202), we get a palindrome (324323141323423).

The spelling of 202221021201221 in words is "two hundred two trillion, two hundred twenty-one billion, twenty-one million, two hundred one thousand, two hundred twenty-one".