202120011109 has 4 divisors (see below), whose sum is σ = 202128268320. Its totient is φ = 202111753900.

The previous prime is 202120011053. The next prime is 202120011139. The reversal of 202120011109 is 901110021202.

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 202120011109 - 2²¹ = 202117913957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202120011139) 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, 4091779 + ... + 4140880.

It is an arithmetic number, because the mean of its divisors is an integer number (50532067080).

Almost surely, 2^202120011109 is an apocalyptic number.

It is an amenable number.

202120011109 is a deficient number, since it is larger than the sum of its proper divisors (8257211).

202120011109 is an equidigital number, since it uses as much as digits as its factorization.

202120011109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8257210.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 202120011109 in words is "two hundred two billion, one hundred twenty million, eleven thousand, one hundred nine".