999032221 has 8 divisors (see below), whose sum is σ = 1094657184. Its totient is φ = 904207920.

The previous prime is 999032219. The next prime is 999032233. The reversal of 999032221 is 122230999.

999032221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 999032221 - 2¹ = 999032219 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 (999032261) 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, 197550 + ... + 202543.

It is an arithmetic number, because the mean of its divisors is an integer number (136832148).

Almost surely, 2^999032221 is an apocalyptic number.

It is an amenable number.

999032221 is a deficient number, since it is larger than the sum of its proper divisors (95624963).

999032221 is a wasteful number, since it uses less digits than its factorization.

999032221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400331.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 999032221 is about 31607.4709681113. The cubic root of 999032221 is about 999.6773028778.

The spelling of 999032221 in words is "nine hundred ninety-nine million, thirty-two thousand, two hundred twenty-one".