23221216 has 12 divisors (see below), whose sum is σ = 45716832. Its totient is φ = 11610592.

The previous prime is 23221193. The next prime is 23221223. The reversal of 23221216 is 61212232.

It is a junction number, because it is equal to n+sod(n) for n = 23221193 and 23221202.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 362800 + ... + 362863.

It is an arithmetic number, because the mean of its divisors is an integer number (3809736).

Almost surely, 2^23221216 is an apocalyptic number.

It is an amenable number.

23221216 is a deficient number, since it is larger than the sum of its proper divisors (22495616).

23221216 is an equidigital number, since it uses as much as digits as its factorization.

23221216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725673 (or 725665 counting only the distinct ones).

The product of its digits is 288, while the sum is 19.

The square root of 23221216 is about 4818.8396943663. The cubic root of 23221216 is about 285.2955423985.

Adding to 23221216 its reverse (61212232), we get a palindrome (84433448).

The spelling of 23221216 in words is "twenty-three million, two hundred twenty-one thousand, two hundred sixteen".