202202012111221 has 4 divisors (see below), whose sum is σ = 209174495287500. Its totient is φ = 195229528934944.

The previous prime is 202202012111161. The next prime is 202202012111257. The reversal of 202202012111221 is 122111210202202.

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 87956055923121 + 114245956188100 = 9378489^2 + 10688590^2 .

It is a cyclic number.

It is not a de Polignac number, because 202202012111221 - 2⁷ = 202202012111093 is a prime.

It is a super-2 number, since 2×202202012111221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202202012117221) 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, 3486241588096 + ... + 3486241588153.

It is an arithmetic number, because the mean of its divisors is an integer number (52293623821875).

Almost surely, 2^{202202012111221} is an apocalyptic number.

It is an amenable number.

202202012111221 is a deficient number, since it is larger than the sum of its proper divisors (6972483176279).

202202012111221 is an equidigital number, since it uses as much as digits as its factorization.

202202012111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6972483176278.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 202202012111221 its reverse (122111210202202), we get a palindrome (324313222313423).

The spelling of 202202012111221 in words is "two hundred two trillion, two hundred two billion, twelve million, one hundred eleven thousand, two hundred twenty-one".