21232307 has 2 divisors, whose sum is σ = 21232308. Its totient is φ = 21232306.

The previous prime is 21232259. The next prime is 21232363. The reversal of 21232307 is 70323212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21232307 - 2²⁴ = 4455091 is a prime.

It is a Chen prime.

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

It is not a weakly prime, because it can be changed into another prime (21232007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616153 + 10616154.

It is an arithmetic number, because the mean of its divisors is an integer number (10616154).

Almost surely, 2^21232307 is an apocalyptic number.

21232307 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232307 is an equidigital number, since it uses as much as digits as its factorization.

21232307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 21232307 is about 4607.8527537238. The cubic root of 21232307 is about 276.9060184154.

Adding to 21232307 its reverse (70323212), we get a palindrome (91555519).

The spelling of 21232307 in words is "twenty-one million, two hundred thirty-two thousand, three hundred seven".