21433440191 has 2 divisors, whose sum is σ = 21433440192. Its totient is φ = 21433440190.

The previous prime is 21433440187. The next prime is 21433440227. The reversal of 21433440191 is 19104433412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21433440191 - 2² = 21433440187 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21433440101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716720095 + 10716720096.

It is an arithmetic number, because the mean of its divisors is an integer number (10716720096).

Almost surely, 2^21433440191 is an apocalyptic number.

21433440191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21433440191 is an equidigital number, since it uses as much as digits as its factorization.

21433440191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 21433440191 in words is "twenty-one billion, four hundred thirty-three million, four hundred forty thousand, one hundred ninety-one".