202100020121 has 4 divisors (see below), whose sum is σ = 202100921472. Its totient is φ = 202099118772.

The previous prime is 202100020117. The next prime is 202100020139. The reversal of 202100020121 is 121020001202.

It is a happy number.

202100020121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 202100020121 - 2² = 202100020117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (202100020621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177716 + ... + 660138.

It is an arithmetic number, because the mean of its divisors is an integer number (50525230368).

Almost surely, 2^202100020121 is an apocalyptic number.

It is an amenable number.

202100020121 is a deficient number, since it is larger than the sum of its proper divisors (901351).

202100020121 is an equidigital number, since it uses as much as digits as its factorization.

202100020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901350.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 202100020121 its reverse (121020001202), we get a palindrome (323120021323).

The spelling of 202100020121 in words is "two hundred two billion, one hundred million, twenty thousand, one hundred twenty-one".