21310213307 has 4 divisors (see below), whose sum is σ = 21886165056. Its totient is φ = 20734261560.

The previous prime is 21310213291. The next prime is 21310213313. The reversal of 21310213307 is 70331201312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21310213307 - 2⁴ = 21310213291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21310213387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287975819 + ... + 287975892.

It is an arithmetic number, because the mean of its divisors is an integer number (5471541264).

Almost surely, 2^21310213307 is an apocalyptic number.

21310213307 is a deficient number, since it is larger than the sum of its proper divisors (575951749).

21310213307 is an equidigital number, since it uses as much as digits as its factorization.

21310213307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575951748.

The product of its (nonzero) digits is 756, while the sum is 23.

Adding to 21310213307 its reverse (70331201312), we get a palindrome (91641414619).

The spelling of 21310213307 in words is "twenty-one billion, three hundred ten million, two hundred thirteen thousand, three hundred seven".