202112020091 has 4 divisors (see below), whose sum is σ = 206812299672. Its totient is φ = 197411740512.

The previous prime is 202112020067. The next prime is 202112020181. The reversal of 202112020091 is 190020211202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 202112020091 - 2²⁶ = 202044911227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202112020051) 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, 2350139726 + ... + 2350139811.

It is an arithmetic number, because the mean of its divisors is an integer number (51703074918).

Almost surely, 2^202112020091 is an apocalyptic number.

202112020091 is a deficient number, since it is larger than the sum of its proper divisors (4700279581).

202112020091 is an equidigital number, since it uses as much as digits as its factorization.

202112020091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4700279580.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 202112020091 its reverse (190020211202), we get a palindrome (392132231293).

The spelling of 202112020091 in words is "two hundred two billion, one hundred twelve million, twenty thousand, ninety-one".