11202120091 has 4 divisors (see below), whose sum is σ = 11203023352. Its totient is φ = 11201216832.

The previous prime is 11202120067. The next prime is 11202120119. The reversal of 11202120091 is 19002120211.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11202120091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11202120991) 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, 432765 + ... + 457918.

It is an arithmetic number, because the mean of its divisors is an integer number (2800755838).

Almost surely, 2^11202120091 is an apocalyptic number.

11202120091 is a deficient number, since it is larger than the sum of its proper divisors (903261).

11202120091 is an equidigital number, since it uses as much as digits as its factorization.

11202120091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903260.

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

The spelling of 11202120091 in words is "eleven billion, two hundred two million, one hundred twenty thousand, ninety-one".