21321322289 has 2 divisors, whose sum is σ = 21321322290. Its totient is φ = 21321322288.

The previous prime is 21321322279. The next prime is 21321322349. The reversal of 21321322289 is 98222312312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21109765264 + 211557025 = 145292^2 + 14545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21321322289 is a prime.

It is not a weakly prime, because it can be changed into another prime (21321322219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660661144 + 10660661145.

It is an arithmetic number, because the mean of its divisors is an integer number (10660661145).

Almost surely, 2^21321322289 is an apocalyptic number.

It is an amenable number.

21321322289 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321322289 is an equidigital number, since it uses as much as digits as its factorization.

21321322289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

The spelling of 21321322289 in words is "twenty-one billion, three hundred twenty-one million, three hundred twenty-two thousand, two hundred eighty-nine".