23193221 has 4 divisors (see below), whose sum is σ = 23222700. Its totient is φ = 23163744.

The previous prime is 23193199. The next prime is 23193227. The reversal of 23193221 is 12239132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19624900 + 3568321 = 4430^2 + 1889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23193221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23193227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13526 + ... + 15143.

It is an arithmetic number, because the mean of its divisors is an integer number (5805675).

It is a self-describing number.

Almost surely, 2^23193221 is an apocalyptic number.

It is an amenable number.

23193221 is a deficient number, since it is larger than the sum of its proper divisors (29479).

23193221 is an equidigital number, since it uses as much as digits as its factorization.

23193221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29478.

The product of its digits is 648, while the sum is 23.

The square root of 23193221 is about 4815.9340734690. The cubic root of 23193221 is about 285.1808475658.

The spelling of 23193221 in words is "twenty-three million, one hundred ninety-three thousand, two hundred twenty-one".