21597091925968 has 40 divisors (see below), whose sum is σ = 46617065145000. Its totient is φ = 9624168282624.

The previous prime is 21597091925953. The next prime is 21597091926029. The reversal of 21597091925968 is 86952919079512.

It can be written as a sum of positive squares in 4 ways, for example, as 3392124099984 + 18204967825984 = 1841772^2 + 4266728^2 .

It is a Smith number, since the sum of its digits (73) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21597091925968.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1790203843 + ... + 1790215906.

It is an arithmetic number, because the mean of its divisors is an integer number (1165426628625).

Almost surely, 2^{21597091925968} is an apocalyptic number.

It is an amenable number.

21597091925968 is an abundant number, since it is smaller than the sum of its proper divisors (25019973219032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21597091925968 is a wasteful number, since it uses less digits than its factorization.

21597091925968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3580419799 (or 3580419793 counting only the distinct ones).

The product of its (nonzero) digits is 220449600, while the sum is 73.

The spelling of 21597091925968 in words is "twenty-one trillion, five hundred ninety-seven billion, ninety-one million, nine hundred twenty-five thousand, nine hundred sixty-eight".