188021120197 has 4 divisors (see below), whose sum is σ = 188026393600. Its totient is φ = 188015846796.

The previous prime is 188021120191. The next prime is 188021120219. The reversal of 188021120197 is 791021120881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 188021120197 - 2³¹ = 185873636549 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 (188021120191) 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, 2582853 + ... + 2654650.

It is an arithmetic number, because the mean of its divisors is an integer number (47006598400).

Almost surely, 2^188021120197 is an apocalyptic number.

It is an amenable number.

188021120197 is a deficient number, since it is larger than the sum of its proper divisors (5273403).

188021120197 is an equidigital number, since it uses as much as digits as its factorization.

188021120197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5273402.

The product of its (nonzero) digits is 16128, while the sum is 40.

The spelling of 188021120197 in words is "one hundred eighty-eight billion, twenty-one million, one hundred twenty thousand, one hundred ninety-seven".