990373547221 has 8 divisors (see below), whose sum is σ = 990691917120. Its totient is φ = 990055241472.

The previous prime is 990373547213. The next prime is 990373547263. The reversal of 990373547221 is 122745373099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 990373547221 - 2³ = 990373547213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990373547291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61152501 + ... + 61168693.

It is an arithmetic number, because the mean of its divisors is an integer number (123836489640).

Almost surely, 2^990373547221 is an apocalyptic number.

It is an amenable number.

990373547221 is a deficient number, since it is larger than the sum of its proper divisors (318369899).

990373547221 is a wasteful number, since it uses less digits than its factorization.

990373547221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32075.

The product of its (nonzero) digits is 2857680, while the sum is 52.

The spelling of 990373547221 in words is "nine hundred ninety billion, three hundred seventy-three million, five hundred forty-seven thousand, two hundred twenty-one".