20210009191 has 4 divisors (see below), whose sum is σ = 20221307800. Its totient is φ = 20198710584.

The previous prime is 20210009177. The next prime is 20210009213. The reversal of 20210009191 is 19190001202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19190001202 = 2 ⋅9595000601.

It is a cyclic number.

It is not a de Polignac number, because 20210009191 - 2²⁹ = 19673138279 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 (20210009791) 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, 5646621 + ... + 5650198.

It is an arithmetic number, because the mean of its divisors is an integer number (5055326950).

Almost surely, 2^20210009191 is an apocalyptic number.

20210009191 is a deficient number, since it is larger than the sum of its proper divisors (11298609).

20210009191 is a wasteful number, since it uses less digits than its factorization.

20210009191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11298608.

The product of its (nonzero) digits is 324, while the sum is 25.

The spelling of 20210009191 in words is "twenty billion, two hundred ten million, nine thousand, one hundred ninety-one".