21202230191 has 2 divisors, whose sum is σ = 21202230192. Its totient is φ = 21202230190.

The previous prime is 21202230167. The next prime is 21202230229. The reversal of 21202230191 is 19103220212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202230191 is a prime.

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 (21202230121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601115095 + 10601115096.

It is an arithmetic number, because the mean of its divisors is an integer number (10601115096).

Almost surely, 2^21202230191 is an apocalyptic number.

21202230191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202230191 is an equidigital number, since it uses as much as digits as its factorization.

21202230191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 21202230191 in words is "twenty-one billion, two hundred two million, two hundred thirty thousand, one hundred ninety-one".