990120332321 has 4 divisors (see below), whose sum is σ = 996194690352. Its totient is φ = 984045974292.

The previous prime is 990120332317. The next prime is 990120332351. The reversal of 990120332321 is 123233021099.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 990120332321 - 2² = 990120332317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990120332351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3037178771 + ... + 3037179096.

It is an arithmetic number, because the mean of its divisors is an integer number (249048672588).

Almost surely, 2^990120332321 is an apocalyptic number.

It is an amenable number.

990120332321 is a deficient number, since it is larger than the sum of its proper divisors (6074358031).

990120332321 is a wasteful number, since it uses less digits than its factorization.

990120332321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6074358030.

The product of its (nonzero) digits is 17496, while the sum is 35.

The spelling of 990120332321 in words is "nine hundred ninety billion, one hundred twenty million, three hundred thirty-two thousand, three hundred twenty-one".