21597226360444 has 24 divisors (see below), whose sum is σ = 43198746540768. Its totient is φ = 9255034050240.

The previous prime is 21597226360421. The next prime is 21597226360531. The reversal of 21597226360444 is 44406362279512.

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, 38050939 + ... + 38614354.

It is an arithmetic number, because the mean of its divisors is an integer number (1799947772532).

Almost surely, 2^{21597226360444} is an apocalyptic number.

It is an amenable number.

21597226360444 is an abundant number, since it is smaller than the sum of its proper divisors (21601520180324).

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

21597226360444 is a wasteful number, since it uses less digits than its factorization.

21597226360444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76675365 (or 76675363 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 55.

The spelling of 21597226360444 in words is "twenty-one trillion, five hundred ninety-seven billion, two hundred twenty-six million, three hundred sixty thousand, four hundred forty-four".