21422042641 has 2 divisors, whose sum is σ = 21422042642. Its totient is φ = 21422042640.

The previous prime is 21422042597. The next prime is 21422042659. The reversal of 21422042641 is 14624022412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19322112016 + 2099930625 = 139004^2 + 45825^2 .

It is a cyclic number.

It is not a de Polignac number, because 21422042641 - 2¹¹ = 21422040593 is a prime.

It is not a weakly prime, because it can be changed into another prime (21422042041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711021320 + 10711021321.

It is an arithmetic number, because the mean of its divisors is an integer number (10711021321).

Almost surely, 2^21422042641 is an apocalyptic number.

It is an amenable number.

21422042641 is a deficient number, since it is larger than the sum of its proper divisors (1).

21422042641 is an equidigital number, since it uses as much as digits as its factorization.

21422042641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6144, while the sum is 28.

The spelling of 21422042641 in words is "twenty-one billion, four hundred twenty-two million, forty-two thousand, six hundred forty-one".