20001100220191 has 4 divisors (see below), whose sum is σ = 20001279179952. Its totient is φ = 20000921260432.

The previous prime is 20001100220159. The next prime is 20001100220201. The reversal of 20001100220191 is 19102200110002.

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 20001100220191 - 2⁵ = 20001100220159 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 (20001100220891) 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, 89312131 + ... + 89535796.

It is an arithmetic number, because the mean of its divisors is an integer number (5000319794988).

Almost surely, 2^{20001100220191} is an apocalyptic number.

20001100220191 is a deficient number, since it is larger than the sum of its proper divisors (178959761).

20001100220191 is a wasteful number, since it uses less digits than its factorization.

20001100220191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178959760.

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

Adding to 20001100220191 its reverse (19102200110002), we get a palindrome (39103300330193).

The spelling of 20001100220191 in words is "twenty trillion, one billion, one hundred million, two hundred twenty thousand, one hundred ninety-one".