23312221 has 4 divisors (see below), whose sum is σ = 24539200. Its totient is φ = 22085244.

The previous prime is 23312147. The next prime is 23312227. The reversal of 23312221 is 12221332.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23312221 - 2¹¹ = 23310173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23312195 and 23312204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23312227) 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, 613461 + ... + 613498.

It is an arithmetic number, because the mean of its divisors is an integer number (6134800).

Almost surely, 2^23312221 is an apocalyptic number.

It is an amenable number.

23312221 is a deficient number, since it is larger than the sum of its proper divisors (1226979).

23312221 is a wasteful number, since it uses less digits than its factorization.

23312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226978.

The product of its digits is 144, while the sum is 16.

The square root of 23312221 is about 4828.2730867257. The cubic root of 23312221 is about 285.6677519811.

Adding to 23312221 its reverse (12221332), we get a palindrome (35533553).

The spelling of 23312221 in words is "twenty-three million, three hundred twelve thousand, two hundred twenty-one".