23221345 has 12 divisors (see below), whose sum is σ = 32415444. Its totient is φ = 15923040.

The previous prime is 23221327. The next prime is 23221349. The reversal of 23221345 is 54312232.

It can be written as a sum of positive squares in 2 ways, for example, as 6964321 + 16257024 = 2639^2 + 4032^2 .

It is not a de Polignac number, because 23221345 - 2⁹ = 23220833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23221349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47146 + ... + 47635.

It is an arithmetic number, because the mean of its divisors is an integer number (2701287).

Almost surely, 2^23221345 is an apocalyptic number.

It is an amenable number.

23221345 is a deficient number, since it is larger than the sum of its proper divisors (9194099).

23221345 is an equidigital number, since it uses as much as digits as its factorization.

23221345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94800 (or 94793 counting only the distinct ones).

The product of its digits is 1440, while the sum is 22.

The square root of 23221345 is about 4818.8530793125. The cubic root of 23221345 is about 285.2960706949.

Adding to 23221345 its reverse (54312232), we get a palindrome (77533577).

The spelling of 23221345 in words is "twenty-three million, two hundred twenty-one thousand, three hundred forty-five".