23221321 has 4 divisors (see below), whose sum is σ = 23232132. Its totient is φ = 23210512.

The previous prime is 23221309. The next prime is 23221327. The reversal of 23221321 is 12312232.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1960000 + 21261321 = 1400^2 + 4611^2 .

It is a cyclic number.

It is not a de Polignac number, because 23221321 - 2⁷ = 23221193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23221295 and 23221304.

It is not an unprimeable number, because it can be changed into a prime (23221327) 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, 970 + ... + 6883.

It is an arithmetic number, because the mean of its divisors is an integer number (5808033).

Almost surely, 2^23221321 is an apocalyptic number.

It is an amenable number.

23221321 is a deficient number, since it is larger than the sum of its proper divisors (10811).

23221321 is an equidigital number, since it uses as much as digits as its factorization.

23221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10810.

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

The square root of 23221321 is about 4818.8505890928. The cubic root of 23221321 is about 285.2959724073.

Adding to 23221321 its reverse (12312232), we get a palindrome (35533553).

The spelling of 23221321 in words is "twenty-three million, two hundred twenty-one thousand, three hundred twenty-one".