21597423434 has 8 divisors (see below), whose sum is σ = 32558930400. Its totient is φ = 10744446636.

The previous prime is 21597423413. The next prime is 21597423437. The reversal of 21597423434 is 43432479512.

It is a happy number.

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

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 3 ways as a sum of consecutive naturals, for example, 27132044 + ... + 27132839.

It is an arithmetic number, because the mean of its divisors is an integer number (4069866300).

Almost surely, 2^21597423434 is an apocalyptic number.

21597423434 is a deficient number, since it is larger than the sum of its proper divisors (10961506966).

21597423434 is a wasteful number, since it uses less digits than its factorization.

21597423434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54265084.

The product of its digits is 725760, while the sum is 44.

The spelling of 21597423434 in words is "twenty-one billion, five hundred ninety-seven million, four hundred twenty-three thousand, four hundred thirty-four".