21310212289 has 2 divisors, whose sum is σ = 21310212290. Its totient is φ = 21310212288.

The previous prime is 21310212251. The next prime is 21310212347. The reversal of 21310212289 is 98221201312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15608754225 + 5701458064 = 124935^2 + 75508^2 .

It is a cyclic number.

It is not a de Polignac number, because 21310212289 - 2⁹ = 21310211777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21310212289.

It is not a weakly prime, because it can be changed into another prime (21310212389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655106144 + 10655106145.

It is an arithmetic number, because the mean of its divisors is an integer number (10655106145).

Almost surely, 2^21310212289 is an apocalyptic number.

It is an amenable number.

21310212289 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310212289 is an equidigital number, since it uses as much as digits as its factorization.

21310212289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The spelling of 21310212289 in words is "twenty-one billion, three hundred ten million, two hundred twelve thousand, two hundred eighty-nine".