21442023408191 has 2 divisors, whose sum is σ = 21442023408192. Its totient is φ = 21442023408190.

The previous prime is 21442023408119. The next prime is 21442023408263. The reversal of 21442023408191 is 19180432024412.

Together with previous prime (21442023408119) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (21442023408119) and next prime (21442023408263).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21442023408191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21442023408391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721011704095 + 10721011704096.

It is an arithmetic number, because the mean of its divisors is an integer number (10721011704096).

Almost surely, 2^{21442023408191} is an apocalyptic number.

21442023408191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21442023408191 is an equidigital number, since it uses as much as digits as its factorization.

21442023408191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 41.

The spelling of 21442023408191 in words is "twenty-one trillion, four hundred forty-two billion, twenty-three million, four hundred eight thousand, one hundred ninety-one".