21209316313439 has 8 divisors (see below), whose sum is σ = 22633749324288. Its totient is φ = 19804530654720.

The previous prime is 21209316313391. The next prime is 21209316313441. The reversal of 21209316313439 is 93431361390212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21209316313439 - 2¹² = 21209316309343 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21209316313393 and 21209316313402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21209316313469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4911835802 + ... + 4911840119.

It is an arithmetic number, because the mean of its divisors is an integer number (2829218665536).

Almost surely, 2^{21209316313439} is an apocalyptic number.

21209316313439 is a deficient number, since it is larger than the sum of its proper divisors (1424433010849).

21209316313439 is a wasteful number, since it uses less digits than its factorization.

21209316313439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9823676065.

The product of its (nonzero) digits is 629856, while the sum is 47.

The spelling of 21209316313439 in words is "twenty-one trillion, two hundred nine billion, three hundred sixteen million, three hundred thirteen thousand, four hundred thirty-nine".