202221002020121 has 4 divisors (see below), whose sum is σ = 231109716594432. Its totient is φ = 173332287445812.

The previous prime is 202221002020099. The next prime is 202221002020223. The reversal of 202221002020121 is 121020200122202.

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.

It is a cyclic number.

It is not a de Polignac number, because 202221002020121 - 2³⁴ = 202203822150937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 202221002020121.

It is not an unprimeable number, because it can be changed into a prime (202221002020021) 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, 14444357287145 + ... + 14444357287158.

It is an arithmetic number, because the mean of its divisors is an integer number (57777429148608).

Almost surely, 2^{202221002020121} is an apocalyptic number.

It is an amenable number.

202221002020121 is a deficient number, since it is larger than the sum of its proper divisors (28888714574311).

202221002020121 is an equidigital number, since it uses as much as digits as its factorization.

202221002020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28888714574310.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 202221002020121 its reverse (121020200122202), we get a palindrome (323241202142323).

The spelling of 202221002020121 in words is "two hundred two trillion, two hundred twenty-one billion, two million, twenty thousand, one hundred twenty-one".