102020211191 has 4 divisors (see below), whose sum is σ = 102072504384. Its totient is φ = 101967918000.

The previous prime is 102020211187. The next prime is 102020211197. The reversal of 102020211191 is 191112020201.

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 102020211191 - 2² = 102020211187 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 (102020211197) 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, 26143670 + ... + 26147571.

It is an arithmetic number, because the mean of its divisors is an integer number (25518126096).

Almost surely, 2^102020211191 is an apocalyptic number.

102020211191 is a deficient number, since it is larger than the sum of its proper divisors (52293193).

102020211191 is an equidigital number, since it uses as much as digits as its factorization.

102020211191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52293192.

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

Adding to 102020211191 its reverse (191112020201), we get a palindrome (293132231392).

The spelling of 102020211191 in words is "one hundred two billion, twenty million, two hundred eleven thousand, one hundred ninety-one".