21232223191 has 2 divisors, whose sum is σ = 21232223192. Its totient is φ = 21232223190.

The previous prime is 21232223179. The next prime is 21232223261. The reversal of 21232223191 is 19132223212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21232223191 - 2²¹ = 21230126039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21232223101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616111595 + 10616111596.

It is an arithmetic number, because the mean of its divisors is an integer number (10616111596).

Almost surely, 2^21232223191 is an apocalyptic number.

21232223191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232223191 is an equidigital number, since it uses as much as digits as its factorization.

21232223191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

The spelling of 21232223191 in words is "twenty-one billion, two hundred thirty-two million, two hundred twenty-three thousand, one hundred ninety-one".