202120100121 has 4 divisors (see below), whose sum is σ = 269493466832. Its totient is φ = 134746733412.

The previous prime is 202120100093. The next prime is 202120100137. The reversal of 202120100121 is 121001021202.

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 not a de Polignac number, because 202120100121 - 2⁵ = 202120100089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202120100097 and 202120100106.

It is not an unprimeable number, because it can be changed into a prime (202120100141) 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, 33686683351 + ... + 33686683356.

It is an arithmetic number, because the mean of its divisors is an integer number (67373366708).

Almost surely, 2^202120100121 is an apocalyptic number.

It is an amenable number.

202120100121 is a deficient number, since it is larger than the sum of its proper divisors (67373366711).

202120100121 is an equidigital number, since it uses as much as digits as its factorization.

202120100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67373366710.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 202120100121 its reverse (121001021202), we get a palindrome (323121121323).

The spelling of 202120100121 in words is "two hundred two billion, one hundred twenty million, one hundred thousand, one hundred twenty-one".