202100102020121 has 4 divisors (see below), whose sum is σ = 204183608226612. Its totient is φ = 200016595813632.

The previous prime is 202100102020093. The next prime is 202100102020129. The reversal of 202100102020121 is 121020201001202.

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 140852652114496 + 61247449905625 = 11868136^2 + 7826075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202100102020121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202100102020096 and 202100102020105.

It is not an unprimeable number, because it can be changed into a prime (202100102020129) 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, 1041753103100 + ... + 1041753103293.

It is an arithmetic number, because the mean of its divisors is an integer number (51045902056653).

Almost surely, 2^{202100102020121} is an apocalyptic number.

It is an amenable number.

202100102020121 is a deficient number, since it is larger than the sum of its proper divisors (2083506206491).

202100102020121 is an equidigital number, since it uses as much as digits as its factorization.

202100102020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2083506206490.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 202100102020121 its reverse (121020201001202), we get a palindrome (323120303021323).

The spelling of 202100102020121 in words is "two hundred two trillion, one hundred billion, one hundred two million, twenty thousand, one hundred twenty-one".