21597439230368 has 24 divisors (see below), whose sum is σ = 42520096765440. Its totient is φ = 10798684496320.

The previous prime is 21597439230361. The next prime is 21597439230397. The reversal of 21597439230368 is 86303293479512.

It is a self number, because there is not a number n which added to its sum of digits gives 21597439230368.

It is not an unprimeable number, because it can be changed into a prime (21597439230361) 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, 10920743 + ... + 12745881.

It is an arithmetic number, because the mean of its divisors is an integer number (1771670698560).

It is a 1-persistent number, because it is pandigital, but 2⋅21597439230368 = 43194878460736 is not.

Almost surely, 2^{21597439230368} is an apocalyptic number.

It is an amenable number.

21597439230368 is a deficient number, since it is larger than the sum of its proper divisors (20922657535072).

21597439230368 is a wasteful number, since it uses less digits than its factorization.

21597439230368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2194940 (or 2194932 counting only the distinct ones).

The product of its (nonzero) digits is 58786560, while the sum is 62.

The spelling of 21597439230368 in words is "twenty-one trillion, five hundred ninety-seven billion, four hundred thirty-nine million, two hundred thirty thousand, three hundred sixty-eight".