21321230089 has 2 divisors, whose sum is σ = 21321230090. Its totient is φ = 21321230088.

The previous prime is 21321230053. The next prime is 21321230101. The reversal of 21321230089 is 98003212312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18260927689 + 3060302400 = 135133^2 + 55320^2 .

It is a cyclic number.

It is not a de Polignac number, because 21321230089 - 2¹³ = 21321221897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21321230089.

It is not a weakly prime, because it can be changed into another prime (21321230039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660615044 + 10660615045.

It is an arithmetic number, because the mean of its divisors is an integer number (10660615045).

Almost surely, 2^21321230089 is an apocalyptic number.

It is an amenable number.

21321230089 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321230089 is an equidigital number, since it uses as much as digits as its factorization.

21321230089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 21321230089 in words is "twenty-one billion, three hundred twenty-one million, two hundred thirty thousand, eighty-nine".