21448372859 has 2 divisors, whose sum is σ = 21448372860. Its totient is φ = 21448372858.

The previous prime is 21448372807. The next prime is 21448372951. The reversal of 21448372859 is 95827384412.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21448372859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21448372859.

It is not a weakly prime, because it can be changed into another prime (21448372259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10724186429 + 10724186430.

It is an arithmetic number, because the mean of its divisors is an integer number (10724186430).

Almost surely, 2^21448372859 is an apocalyptic number.

21448372859 is a deficient number, since it is larger than the sum of its proper divisors (1).

21448372859 is an equidigital number, since it uses as much as digits as its factorization.

21448372859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3870720, while the sum is 53.

The spelling of 21448372859 in words is "twenty-one billion, four hundred forty-eight million, three hundred seventy-two thousand, eight hundred fifty-nine".