221001393 has 8 divisors (see below), whose sum is σ = 294789088. Its totient is φ = 147273984.

The previous prime is 221001367. The next prime is 221001397. The reversal of 221001393 is 393100122.

It is a happy number.

221001393 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 221001393 - 2⁹ = 221000881 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221001397) 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, 5680 + ... + 21777.

It is an arithmetic number, because the mean of its divisors is an integer number (36848636).

Almost surely, 2^221001393 is an apocalyptic number.

It is an amenable number.

221001393 is a deficient number, since it is larger than the sum of its proper divisors (73787695).

221001393 is a wasteful number, since it uses less digits than its factorization.

221001393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30143.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 221001393 is about 14866.1155989048. The cubic root of 221001393 is about 604.5956298851.

The spelling of 221001393 in words is "two hundred twenty-one million, one thousand, three hundred ninety-three".