23212321 has 16 divisors (see below), whose sum is σ = 25979328. Its totient is φ = 20563200.

The previous prime is 23212297. The next prime is 23212331. The reversal of 23212321 is 12321232.

23212321 = 324² + 325² + ... + 469².

23212321 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a cyclic number.

It is not a de Polignac number, because 23212321 - 2⁵ = 23212289 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a deceptive number, since it divides R_23212320.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23212295 and 23212304.

It is not an unprimeable number, because it can be changed into a prime (23212331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109906 + ... + 110116.

It is an arithmetic number, because the mean of its divisors is an integer number (1623708).

Almost surely, 2^23212321 is an apocalyptic number.

It is an amenable number.

23212321 is a deficient number, since it is larger than the sum of its proper divisors (2767007).

23212321 is a wasteful number, since it uses less digits than its factorization.

23212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432.

The product of its digits is 144, while the sum is 16.

The square root of 23212321 is about 4817.9166659460. The cubic root of 23212321 is about 285.2591097967.

Adding to 23212321 its reverse (12321232), we get a palindrome (35533553).

The spelling of 23212321 in words is "twenty-three million, two hundred twelve thousand, three hundred twenty-one".