21120000191 has 2 divisors, whose sum is σ = 21120000192. Its totient is φ = 21120000190.

The previous prime is 21120000151. The next prime is 21120000193. The reversal of 21120000191 is 19100002112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21120000191 is a prime.

Together with 21120000193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120000193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560000095 + 10560000096.

It is an arithmetic number, because the mean of its divisors is an integer number (10560000096).

Almost surely, 2^21120000191 is an apocalyptic number.

21120000191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120000191 is an equidigital number, since it uses as much as digits as its factorization.

21120000191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 21120000191 in words is "twenty-one billion, one hundred twenty million, one hundred ninety-one", and thus it is an aban number.