21444000289 has 2 divisors, whose sum is σ = 21444000290. Its totient is φ = 21444000288.

The previous prime is 21444000271. The next prime is 21444000293. The reversal of 21444000289 is 98200044412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13504299264 + 7939701025 = 116208^2 + 89105^2 .

It is a cyclic number.

It is not a de Polignac number, because 21444000289 - 2⁵ = 21444000257 is a prime.

It is not a weakly prime, because it can be changed into another prime (21444000689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10722000144 + 10722000145.

It is an arithmetic number, because the mean of its divisors is an integer number (10722000145).

Almost surely, 2^21444000289 is an apocalyptic number.

It is an amenable number.

21444000289 is a deficient number, since it is larger than the sum of its proper divisors (1).

21444000289 is an equidigital number, since it uses as much as digits as its factorization.

21444000289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 34.

The spelling of 21444000289 in words is "twenty-one billion, four hundred forty-four million, two hundred eighty-nine", and thus it is an aban number.