23112221 has 4 divisors (see below), whose sum is σ = 25213344. Its totient is φ = 21011100.

The previous prime is 23112209. The next prime is 23112239. The reversal of 23112221 is 12221132.

It is a happy number.

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 not a de Polignac number, because 23112221 - 2⁶ = 23112157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23112196 and 23112205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23112121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050545 + ... + 1050566.

It is an arithmetic number, because the mean of its divisors is an integer number (6303336).

Almost surely, 2^23112221 is an apocalyptic number.

It is an amenable number.

23112221 is a deficient number, since it is larger than the sum of its proper divisors (2101123).

23112221 is a wasteful number, since it uses less digits than its factorization.

23112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101122.

The product of its digits is 48, while the sum is 14.

The square root of 23112221 is about 4807.5171346549. The cubic root of 23112221 is about 284.8484718252.

Adding to 23112221 its reverse (12221132), we get a palindrome (35333353).

The spelling of 23112221 in words is "twenty-three million, one hundred twelve thousand, two hundred twenty-one".