21442303889 has 2 divisors, whose sum is σ = 21442303890. Its totient is φ = 21442303888.

The previous prime is 21442303859. The next prime is 21442303931. The reversal of 21442303889 is 98830324412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17189307664 + 4252996225 = 131108^2 + 65215^2 .

It is a cyclic number.

It is not a de Polignac number, because 21442303889 - 2¹² = 21442299793 is a prime.

It is not a weakly prime, because it can be changed into another prime (21442303849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10721151944 + 10721151945.

It is an arithmetic number, because the mean of its divisors is an integer number (10721151945).

Almost surely, 2^21442303889 is an apocalyptic number.

It is an amenable number.

21442303889 is a deficient number, since it is larger than the sum of its proper divisors (1).

21442303889 is an equidigital number, since it uses as much as digits as its factorization.

21442303889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 331776, while the sum is 44.

The spelling of 21442303889 in words is "twenty-one billion, four hundred forty-two million, three hundred three thousand, eight hundred eighty-nine".