21597423433 has 8 divisors (see below), whose sum is σ = 21945319200. Its totient is φ = 21252278208.

The previous prime is 21597423413. The next prime is 21597423437. The reversal of 21597423433 is 33432479512.

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 21597423433 - 2²¹ = 21595326281 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21597423433.

It is not an unprimeable number, because it can be changed into a prime (21597423437) 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, 671803 + ... + 703216.

It is an arithmetic number, because the mean of its divisors is an integer number (2743164900).

Almost surely, 2^21597423433 is an apocalyptic number.

It is an amenable number.

21597423433 is a deficient number, since it is larger than the sum of its proper divisors (347895767).

21597423433 is a wasteful number, since it uses less digits than its factorization.

21597423433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375271.

The product of its digits is 544320, while the sum is 43.

The spelling of 21597423433 in words is "twenty-one billion, five hundred ninety-seven million, four hundred twenty-three thousand, four hundred thirty-three".