23232721 has 2 divisors, whose sum is σ = 23232722. Its totient is φ = 23232720.

The previous prime is 23232701. The next prime is 23232743. The reversal of 23232721 is 12723232.

It is an a-pointer prime, because the next prime (23232743) can be obtained adding 23232721 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23040000 + 192721 = 4800^2 + 439^2 .

It is a cyclic number.

It is not a de Polignac number, because 23232721 - 2¹³ = 23224529 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 23232692 and 23232701.

It is not a weakly prime, because it can be changed into another prime (23232701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11616360 + 11616361.

It is an arithmetic number, because the mean of its divisors is an integer number (11616361).

Almost surely, 2^23232721 is an apocalyptic number.

It is an amenable number.

23232721 is a deficient number, since it is larger than the sum of its proper divisors (1).

23232721 is an equidigital number, since it uses as much as digits as its factorization.

23232721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 22.

The square root of 23232721 is about 4820.0332986402. The cubic root of 23232721 is about 285.3426513768.

Adding to 23232721 its reverse (12723232), we get a palindrome (35955953).

The spelling of 23232721 in words is "twenty-three million, two hundred thirty-two thousand, seven hundred twenty-one".