20021103191 has 4 divisors (see below), whose sum is σ = 20021587584. Its totient is φ = 20020618800.

The previous prime is 20021103173. The next prime is 20021103239. The reversal of 20021103191 is 19130112002.

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 20021103191 - 2⁶ = 20021103127 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 (20021103121) 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, 173750 + ... + 265011.

It is an arithmetic number, because the mean of its divisors is an integer number (5005396896).

Almost surely, 2^20021103191 is an apocalyptic number.

20021103191 is a deficient number, since it is larger than the sum of its proper divisors (484393).

20021103191 is an equidigital number, since it uses as much as digits as its factorization.

20021103191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484392.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 20021103191 its reverse (19130112002), we get a palindrome (39151215193).

The spelling of 20021103191 in words is "twenty billion, twenty-one million, one hundred three thousand, one hundred ninety-one".