21033110191 has 2 divisors, whose sum is σ = 21033110192. Its totient is φ = 21033110190.

The previous prime is 21033110099. The next prime is 21033110251. The reversal of 21033110191 is 19101133012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21033110191 - 2²³ = 21024721583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21033110291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516555095 + 10516555096.

It is an arithmetic number, because the mean of its divisors is an integer number (10516555096).

Almost surely, 2^21033110191 is an apocalyptic number.

21033110191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033110191 is an equidigital number, since it uses as much as digits as its factorization.

21033110191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 22.

The spelling of 21033110191 in words is "twenty-one billion, thirty-three million, one hundred ten thousand, one hundred ninety-one".