993673221 has 16 divisors (see below), whose sum is σ = 1383777600. Its totient is φ = 633616128.

The previous prime is 993673217. The next prime is 993673277. The reversal of 993673221 is 122376399.

It is not a de Polignac number, because 993673221 - 2² = 993673217 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (993673211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69316 + ... + 82413.

It is an arithmetic number, because the mean of its divisors is an integer number (86486100).

Almost surely, 2^993673221 is an apocalyptic number.

It is an amenable number.

993673221 is a deficient number, since it is larger than the sum of its proper divisors (390104379).

993673221 is a wasteful number, since it uses less digits than its factorization.

993673221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151828.

The product of its digits is 122472, while the sum is 42.

The square root of 993673221 is about 31522.5827146191. The cubic root of 993673221 is about 997.8866103975.

The spelling of 993673221 in words is "nine hundred ninety-three million, six hundred seventy-three thousand, two hundred twenty-one".