21406010191 has 2 divisors, whose sum is σ = 21406010192. Its totient is φ = 21406010190.

The previous prime is 21406010161. The next prime is 21406010221. The reversal of 21406010191 is 19101060412.

It is a balanced prime because it is at equal distance from previous prime (21406010161) and next prime (21406010221).

It is a cyclic number.

It is not a de Polignac number, because 21406010191 - 2¹³ = 21406001999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21406010161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10703005095 + 10703005096.

It is an arithmetic number, because the mean of its divisors is an integer number (10703005096).

Almost surely, 2^21406010191 is an apocalyptic number.

21406010191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21406010191 is an equidigital number, since it uses as much as digits as its factorization.

21406010191 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 25.

The spelling of 21406010191 in words is "twenty-one billion, four hundred six million, ten thousand, one hundred ninety-one".