20112021100091 has 4 divisors (see below), whose sum is σ = 20119060662312. Its totient is φ = 20104981537872.

The previous prime is 20112021100049. The next prime is 20112021100097. The reversal of 20112021100091 is 19000112021102.

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-20112021100091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20112021100097) 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, 3519776825 + ... + 3519782538.

It is an arithmetic number, because the mean of its divisors is an integer number (5029765165578).

Almost surely, 2^{20112021100091} is an apocalyptic number.

20112021100091 is a deficient number, since it is larger than the sum of its proper divisors (7039562221).

20112021100091 is an equidigital number, since it uses as much as digits as its factorization.

20112021100091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7039562220.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 20112021100091 its reverse (19000112021102), we get a palindrome (39112133121193).

The spelling of 20112021100091 in words is "twenty trillion, one hundred twelve billion, twenty-one million, one hundred thousand, ninety-one".