21232123207 has 2 divisors, whose sum is σ = 21232123208. Its totient is φ = 21232123206.

The previous prime is 21232123163. The next prime is 21232123217. The reversal of 21232123207 is 70232123212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21232123207 - 2⁷ = 21232123079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21232123217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616061603 + 10616061604.

It is an arithmetic number, because the mean of its divisors is an integer number (10616061604).

Almost surely, 2^21232123207 is an apocalyptic number.

21232123207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232123207 is an equidigital number, since it uses as much as digits as its factorization.

21232123207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 25.

Adding to 21232123207 its reverse (70232123212), we get a palindrome (91464246419).

The spelling of 21232123207 in words is "twenty-one billion, two hundred thirty-two million, one hundred twenty-three thousand, two hundred seven".