996644221 has 8 divisors (see below), whose sum is σ = 1050533600. Its totient is φ = 942898320.

The previous prime is 996644191. The next prime is 996644237. The reversal of 996644221 is 122446699.

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 996644221 - 2⁷ = 996644093 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (996644521) 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, 21450 + ... + 49531.

It is an arithmetic number, because the mean of its divisors is an integer number (131316700).

Almost surely, 2^996644221 is an apocalyptic number.

It is an amenable number.

996644221 is a deficient number, since it is larger than the sum of its proper divisors (53889379).

996644221 is a wasteful number, since it uses less digits than its factorization.

996644221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71739.

The product of its digits is 186624, while the sum is 43.

The square root of 996644221 is about 31569.6724880066. The cubic root of 996644221 is about 998.8801534117.

The spelling of 996644221 in words is "nine hundred ninety-six million, six hundred forty-four thousand, two hundred twenty-one".