21141243191 has 2 divisors, whose sum is σ = 21141243192. Its totient is φ = 21141243190.

The previous prime is 21141243169. The next prime is 21141243203. The reversal of 21141243191 is 19134214112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21141243191 - 2⁶ = 21141243127 is a prime.

It is a super-2 number, since 2×21141243191² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21141243391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570621595 + 10570621596.

It is an arithmetic number, because the mean of its divisors is an integer number (10570621596).

Almost surely, 2^21141243191 is an apocalyptic number.

21141243191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21141243191 is an equidigital number, since it uses as much as digits as its factorization.

21141243191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 29.

The spelling of 21141243191 in words is "twenty-one billion, one hundred forty-one million, two hundred forty-three thousand, one hundred ninety-one".