21312010219 has 2 divisors, whose sum is σ = 21312010220. Its totient is φ = 21312010218.

The previous prime is 21312010201. The next prime is 21312010277. The reversal of 21312010219 is 91201021312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21312010219 - 2¹⁹ = 21311485931 is a prime.

It is a super-2 number, since 2×21312010219² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21312010219.

It is not a weakly prime, because it can be changed into another prime (21312019219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656005109 + 10656005110.

It is an arithmetic number, because the mean of its divisors is an integer number (10656005110).

Almost surely, 2^21312010219 is an apocalyptic number.

21312010219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21312010219 is an equidigital number, since it uses as much as digits as its factorization.

21312010219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 21312010219 in words is "twenty-one billion, three hundred twelve million, ten thousand, two hundred nineteen".