21411110191 has 2 divisors, whose sum is σ = 21411110192. Its totient is φ = 21411110190.

The previous prime is 21411110177. The next prime is 21411110257. The reversal of 21411110191 is 19101111412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21411110191 - 2⁹ = 21411109679 is a prime.

It is a super-2 number, since 2×21411110191² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21411110141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10705555095 + 10705555096.

It is an arithmetic number, because the mean of its divisors is an integer number (10705555096).

Almost surely, 2^21411110191 is an apocalyptic number.

21411110191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21411110191 is an equidigital number, since it uses as much as digits as its factorization.

21411110191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 22.

The spelling of 21411110191 in words is "twenty-one billion, four hundred eleven million, one hundred ten thousand, one hundred ninety-one".