202221212201221 has 4 divisors (see below), whose sum is σ = 202231788090444. Its totient is φ = 202210636312000.

The previous prime is 202221212201207. The next prime is 202221212201321. The reversal of 202221212201221 is 122102212122202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 118537961100196 + 83683251101025 = 10887514^2 + 9147855^2 .

It is a cyclic number.

It is not a de Polignac number, because 202221212201221 - 2¹⁵ = 202221212168453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202221212201192 and 202221212201201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202221212201321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5287915930 + ... + 5287954171.

It is an arithmetic number, because the mean of its divisors is an integer number (50557947022611).

Almost surely, 2^{202221212201221} is an apocalyptic number.

It is an amenable number.

202221212201221 is a deficient number, since it is larger than the sum of its proper divisors (10575889223).

202221212201221 is a wasteful number, since it uses less digits than its factorization.

202221212201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10575889222.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 202221212201221 its reverse (122102212122202), we get a palindrome (324323424323423).

The spelling of 202221212201221 in words is "two hundred two trillion, two hundred twenty-one billion, two hundred twelve million, two hundred one thousand, two hundred twenty-one".