9990021331 has 2 divisors, whose sum is σ = 9990021332. Its totient is φ = 9990021330.

The previous prime is 9990021299. The next prime is 9990021361. The reversal of 9990021331 is 1331200999.

9990021331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (1331200999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9990021331 - 2⁵ = 9990021299 is a prime.

It is a super-2 number, since 2×9990021331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9990021361) 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, 4995010665 + 4995010666.

It is an arithmetic number, because the mean of its divisors is an integer number (4995010666).

Almost surely, 2^9990021331 is an apocalyptic number.

9990021331 is a deficient number, since it is larger than the sum of its proper divisors (1).

9990021331 is an equidigital number, since it uses as much as digits as its factorization.

9990021331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 9990021331 is about 99950.0942020567. The cubic root of 9990021331 is about 2153.7178385164.

The spelling of 9990021331 in words is "nine billion, nine hundred ninety million, twenty-one thousand, three hundred thirty-one".