23212445 has 4 divisors (see below), whose sum is σ = 27854940. Its totient is φ = 18569952.

The previous prime is 23212439. The next prime is 23212447. The reversal of 23212445 is 54421232.

It is a happy number.

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 11303044 + 11909401 = 3362^2 + 3451^2 .

It is a cyclic number.

It is not a de Polignac number, because 23212445 - 2⁶ = 23212381 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 23212445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23212447) 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, 2321240 + ... + 2321249.

It is an arithmetic number, because the mean of its divisors is an integer number (6963735).

Almost surely, 2^23212445 is an apocalyptic number.

It is an amenable number.

23212445 is a deficient number, since it is larger than the sum of its proper divisors (4642495).

23212445 is an equidigital number, since it uses as much as digits as its factorization.

23212445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4642494.

The product of its digits is 1920, while the sum is 23.

The square root of 23212445 is about 4817.9295345615. The cubic root of 23212445 is about 285.2596177463.

Adding to 23212445 its reverse (54421232), we get a palindrome (77633677).

The spelling of 23212445 in words is "twenty-three million, two hundred twelve thousand, four hundred forty-five".