996993021 has 8 divisors (see below), whose sum is σ = 1330661344. Its totient is φ = 663993360.

The previous prime is 996992989. The next prime is 996993043. The reversal of 996993021 is 120399699.

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

It is not a de Polignac number, because 996993021 - 2⁵ = 996992989 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 (996993091) 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, 163675 + ... + 169656.

It is an arithmetic number, because the mean of its divisors is an integer number (166332668).

Almost surely, 2^996993021 is an apocalyptic number.

It is an amenable number.

996993021 is a deficient number, since it is larger than the sum of its proper divisors (333668323).

996993021 is a wasteful number, since it uses less digits than its factorization.

996993021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334331.

The product of its (nonzero) digits is 236196, while the sum is 48.

The square root of 996993021 is about 31575.1962939267. The cubic root of 996993021 is about 998.9966673269.

The spelling of 996993021 in words is "nine hundred ninety-six million, nine hundred ninety-three thousand, twenty-one".