221313393 has 12 divisors (see below), whose sum is σ = 365342848. Its totient is φ = 126464760.

The previous prime is 221313377. The next prime is 221313401. The reversal of 221313393 is 393313122.

It is not a de Polignac number, because 221313393 - 2⁴ = 221313377 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 (221313193) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1756393 + ... + 1756518.

Almost surely, 2^221313393 is an apocalyptic number.

It is an amenable number.

221313393 is a deficient number, since it is larger than the sum of its proper divisors (144029455).

221313393 is a wasteful number, since it uses less digits than its factorization.

221313393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3512924 (or 3512921 counting only the distinct ones).

The product of its digits is 2916, while the sum is 27.

The square root of 221313393 is about 14876.6055604093. The cubic root of 221313393 is about 604.8800098992.

The spelling of 221313393 in words is "two hundred twenty-one million, three hundred thirteen thousand, three hundred ninety-three".