9990201321 has 12 divisors (see below), whose sum is σ = 14453611120. Its totient is φ = 6649371000.

The previous prime is 9990201289. The next prime is 9990201337. The reversal of 9990201321 is 1231020999.

It is a happy number.

It is not a de Polignac number, because 9990201321 - 2⁵ = 9990201289 is a prime.

It is a super-2 number, since 2×9990201321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9990201421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 891055 + ... + 902196.

Almost surely, 2^9990201321 is an apocalyptic number.

It is an amenable number.

9990201321 is a deficient number, since it is larger than the sum of its proper divisors (4463409799).

9990201321 is a wasteful number, since it uses less digits than its factorization.

9990201321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793876 (or 1793873 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 9990201321 is about 99950.9945973526. The cubic root of 9990201321 is about 2153.7307729347.

The spelling of 9990201321 in words is "nine billion, nine hundred ninety million, two hundred one thousand, three hundred twenty-one".