23355221 has 4 divisors (see below), whose sum is σ = 23455692. Its totient is φ = 23254752.

The previous prime is 23355191. The next prime is 23355247. The reversal of 23355221 is 12255332.

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 3204100 + 20151121 = 1790^2 + 4489^2 .

It is a cyclic number.

It is not a de Polignac number, because 23355221 - 2¹⁰ = 23354197 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 (23355271) 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, 49886 + ... + 50351.

It is an arithmetic number, because the mean of its divisors is an integer number (5863923).

Almost surely, 2^23355221 is an apocalyptic number.

It is an amenable number.

23355221 is a deficient number, since it is larger than the sum of its proper divisors (100471).

23355221 is a wasteful number, since it uses less digits than its factorization.

23355221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100470.

The product of its digits is 1800, while the sum is 23.

The square root of 23355221 is about 4832.7239730818. The cubic root of 23355221 is about 285.8432846416.

The spelling of 23355221 in words is "twenty-three million, three hundred fifty-five thousand, two hundred twenty-one".