21331243607 has 2 divisors, whose sum is σ = 21331243608. Its totient is φ = 21331243606.

The previous prime is 21331243603. The next prime is 21331243631. The reversal of 21331243607 is 70634213312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21331243607 - 2² = 21331243603 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21331243603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665621803 + 10665621804.

It is an arithmetic number, because the mean of its divisors is an integer number (10665621804).

Almost surely, 2^21331243607 is an apocalyptic number.

21331243607 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331243607 is an equidigital number, since it uses as much as digits as its factorization.

21331243607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 32.

Adding to 21331243607 its reverse (70634213312), we get a palindrome (91965456919).

The spelling of 21331243607 in words is "twenty-one billion, three hundred thirty-one million, two hundred forty-three thousand, six hundred seven".