21444285959 has 2 divisors, whose sum is σ = 21444285960. Its totient is φ = 21444285958.

The previous prime is 21444285943. The next prime is 21444285977. The reversal of 21444285959 is 95958244412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21444285959 - 2⁴ = 21444285943 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21444285959.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21444281959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10722142979 + 10722142980.

It is an arithmetic number, because the mean of its divisors is an integer number (10722142980).

Almost surely, 2^21444285959 is an apocalyptic number.

21444285959 is a deficient number, since it is larger than the sum of its proper divisors (1).

21444285959 is an equidigital number, since it uses as much as digits as its factorization.

21444285959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4147200, while the sum is 53.

The spelling of 21444285959 in words is "twenty-one billion, four hundred forty-four million, two hundred eighty-five thousand, nine hundred fifty-nine".