8021216389 has 2 divisors, whose sum is σ = 8021216390. Its totient is φ = 8021216388.

The previous prime is 8021216387. The next prime is 8021216419. The reversal of 8021216389 is 9836121208.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6898631364 + 1122585025 = 83058^2 + 33505^2 .

It is a cyclic number.

It is not a de Polignac number, because 8021216389 - 2¹ = 8021216387 is a prime.

Together with 8021216387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8021216381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4010608194 + 4010608195.

It is an arithmetic number, because the mean of its divisors is an integer number (4010608195).

Almost surely, 2^8021216389 is an apocalyptic number.

It is an amenable number.

8021216389 is a deficient number, since it is larger than the sum of its proper divisors (1).

8021216389 is an equidigital number, since it uses as much as digits as its factorization.

8021216389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 8021216389 is about 89561.2437888175. The cubic root of 8021216389 is about 2001.7664717461.

The spelling of 8021216389 in words is "eight billion, twenty-one million, two hundred sixteen thousand, three hundred eighty-nine".