990001323303021 has 12 divisors (see below), whose sum is σ = 1440289694975040. Its totient is φ = 655252674415560.

The previous prime is 990001323303019. The next prime is 990001323303023. The reversal of 990001323303021 is 120303323100099.

It is a happy number.

990001323303021 is a `hidden beast` number, since 9 + 9 + 0 + 0 + 0 + 1 + 323 + 303 + 0 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (990001323303019) and next prime (990001323303023).

It is not a de Polignac number, because 990001323303021 - 2¹ = 990001323303019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990001323303023) 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, 395683980885 + ... + 395683983386.

It is an arithmetic number, because the mean of its divisors is an integer number (120024141247920).

Almost surely, 2^{990001323303021} is an apocalyptic number.

It is an amenable number.

990001323303021 is a deficient number, since it is larger than the sum of its proper divisors (450288371672019).

990001323303021 is a wasteful number, since it uses less digits than its factorization.

990001323303021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791367964416 (or 791367964413 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 36.

The spelling of 990001323303021 in words is "nine hundred ninety trillion, one billion, three hundred twenty-three million, three hundred three thousand, twenty-one".