21645132359 has 8 divisors (see below), whose sum is σ = 22013336448. Its totient is φ = 21278256120.

The previous prime is 21645132347. The next prime is 21645132413. The reversal of 21645132359 is 95323154612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21645132359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21645132559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 299057 + ... + 364314.

It is an arithmetic number, because the mean of its divisors is an integer number (2751667056).

Almost surely, 2^21645132359 is an apocalyptic number.

21645132359 is a deficient number, since it is larger than the sum of its proper divisors (368204089).

21645132359 is an equidigital number, since it uses as much as digits as its factorization.

21645132359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663925.

The product of its digits is 194400, while the sum is 41.

The spelling of 21645132359 in words is "twenty-one billion, six hundred forty-five million, one hundred thirty-two thousand, three hundred fifty-nine".