21444120422191 has 2 divisors, whose sum is σ = 21444120422192. Its totient is φ = 21444120422190.

The previous prime is 21444120422173. The next prime is 21444120422299. The reversal of 21444120422191 is 19122402144412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21444120422191 - 2⁴¹ = 19245097166639 is a prime.

It is a super-2 number, since 2×21444120422191² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21444120422191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21444120422141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10722060211095 + 10722060211096.

It is an arithmetic number, because the mean of its divisors is an integer number (10722060211096).

Almost surely, 2^{21444120422191} is an apocalyptic number.

21444120422191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21444120422191 is an equidigital number, since it uses as much as digits as its factorization.

21444120422191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36864, while the sum is 37.

The spelling of 21444120422191 in words is "twenty-one trillion, four hundred forty-four billion, one hundred twenty million, four hundred twenty-two thousand, one hundred ninety-one".