21110424091 has 2 divisors, whose sum is σ = 21110424092. Its totient is φ = 21110424090.

The previous prime is 21110424089. The next prime is 21110424103. The reversal of 21110424091 is 19042401112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21110424091 - 2¹ = 21110424089 is a prime.

Together with 21110424089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21110424001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555212045 + 10555212046.

It is an arithmetic number, because the mean of its divisors is an integer number (10555212046).

Almost surely, 2^21110424091 is an apocalyptic number.

21110424091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110424091 is an equidigital number, since it uses as much as digits as its factorization.

21110424091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 21110424091 in words is "twenty-one billion, one hundred ten million, four hundred twenty-four thousand, ninety-one".