23221644 has 24 divisors (see below), whose sum is σ = 55649328. Its totient is φ = 7531200.

The previous prime is 23221631. The next prime is 23221669. The reversal of 23221644 is 44612232.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 25707 + ... + 26594.

It is an arithmetic number, because the mean of its divisors is an integer number (2318722).

Almost surely, 2^23221644 is an apocalyptic number.

It is an amenable number.

23221644 is an abundant number, since it is smaller than the sum of its proper divisors (32427684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23221644 is a wasteful number, since it uses less digits than its factorization.

23221644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52345 (or 52343 counting only the distinct ones).

The product of its digits is 2304, while the sum is 24.

The square root of 23221644 is about 4818.8841031924. The cubic root of 23221644 is about 285.2972951884.

Adding to 23221644 its reverse (44612232), we get a palindrome (67833876).

The spelling of 23221644 in words is "twenty-three million, two hundred twenty-one thousand, six hundred forty-four".