21310308367 has 4 divisors (see below), whose sum is σ = 22563855936. Its totient is φ = 20056760800.

The previous prime is 21310308359. The next prime is 21310308373. The reversal of 21310308367 is 76380301312.

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 21310308367 - 2³ = 21310308359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310308347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 626773759 + ... + 626773792.

It is an arithmetic number, because the mean of its divisors is an integer number (5640963984).

Almost surely, 2^21310308367 is an apocalyptic number.

21310308367 is a deficient number, since it is larger than the sum of its proper divisors (1253547569).

21310308367 is a wasteful number, since it uses less digits than its factorization.

21310308367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253547568.

The product of its (nonzero) digits is 18144, while the sum is 34.

Adding to 21310308367 its reverse (76380301312), we get a palindrome (97690609679).

The spelling of 21310308367 in words is "twenty-one billion, three hundred ten million, three hundred eight thousand, three hundred sixty-seven".