202000121221 has 4 divisors (see below), whose sum is σ = 202031247744. Its totient is φ = 201968994700.

The previous prime is 202000121203. The next prime is 202000121249. The reversal of 202000121221 is 122121000202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122121000202 = 2 ⋅61060500101.

It is a cyclic number.

It is not a de Polignac number, because 202000121221 - 2¹¹ = 202000119173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202000125221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15553525 + ... + 15566506.

It is an arithmetic number, because the mean of its divisors is an integer number (50507811936).

Almost surely, 2^202000121221 is an apocalyptic number.

It is an amenable number.

202000121221 is a deficient number, since it is larger than the sum of its proper divisors (31126523).

202000121221 is an equidigital number, since it uses as much as digits as its factorization.

202000121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31126522.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 202000121221 its reverse (122121000202), we get a palindrome (324121121423).

The spelling of 202000121221 in words is "two hundred two billion, one hundred twenty-one thousand, two hundred twenty-one".