202201221012121 has 4 divisors (see below), whose sum is σ = 202537662312244. Its totient is φ = 201864779712000.

The previous prime is 202201221012079. The next prime is 202201221012143. The reversal of 202201221012121 is 121210122102202.

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 98994639656025 + 103206581356096 = 9949605^2 + 10159064^2 .

It is a cyclic number.

It is not a de Polignac number, because 202201221012121 - 2²³ = 202201212623513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202201221012191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168220649160 + ... + 168220650361.

It is an arithmetic number, because the mean of its divisors is an integer number (50634415578061).

Almost surely, 2^{202201221012121} is an apocalyptic number.

It is an amenable number.

202201221012121 is a deficient number, since it is larger than the sum of its proper divisors (336441300123).

202201221012121 is an equidigital number, since it uses as much as digits as its factorization.

202201221012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336441300122.

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

Adding to 202201221012121 its reverse (121210122102202), we get a palindrome (323411343114323).

The spelling of 202201221012121 in words is "two hundred two trillion, two hundred one billion, two hundred twenty-one million, twelve thousand, one hundred twenty-one".