999367021 has 2 divisors, whose sum is σ = 999367022. Its totient is φ = 999367020.

The previous prime is 999367009. The next prime is 999367051. The reversal of 999367021 is 120763999.

999367021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 703045225 + 296321796 = 26515^2 + 17214^2 .

It is an emirp because it is prime and its reverse (120763999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999367021 - 2¹⁵ = 999334253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999367051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499683510 + 499683511.

It is an arithmetic number, because the mean of its divisors is an integer number (499683511).

Almost surely, 2^999367021 is an apocalyptic number.

It is an amenable number.

999367021 is a deficient number, since it is larger than the sum of its proper divisors (1).

999367021 is an equidigital number, since it uses as much as digits as its factorization.

999367021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 183708, while the sum is 46.

The square root of 999367021 is about 31612.7667406698. The cubic root of 999367021 is about 999.7889624663.

The spelling of 999367021 in words is "nine hundred ninety-nine million, three hundred sixty-seven thousand, twenty-one".