21310308347 has 2 divisors, whose sum is σ = 21310308348. Its totient is φ = 21310308346.

The previous prime is 21310308343. The next prime is 21310308359. The reversal of 21310308347 is 74380301312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21310308347 - 2² = 21310308343 is a prime.

It is not a weakly prime, because it can be changed into another prime (21310308343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655154173 + 10655154174.

It is an arithmetic number, because the mean of its divisors is an integer number (10655154174).

Almost surely, 2^21310308347 is an apocalyptic number.

21310308347 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310308347 is an equidigital number, since it uses as much as digits as its factorization.

21310308347 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 32.

Adding to 21310308347 its reverse (74380301312), we get a palindrome (95690609659).

The spelling of 21310308347 in words is "twenty-one billion, three hundred ten million, three hundred eight thousand, three hundred forty-seven".