21594358073 has 8 divisors (see below), whose sum is σ = 22341950280. Its totient is φ = 20846963200.

The previous prime is 21594358061. The next prime is 21594358091. The reversal of 21594358073 is 37085349512.

It can be written as a sum of positive squares in 4 ways, for example, as 2386615609 + 19207742464 = 48853^2 + 138592^2 .

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

It is not a de Polignac number, because 21594358073 - 2⁴ = 21594358057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21594358003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193673 + ... + 284073.

It is an arithmetic number, because the mean of its divisors is an integer number (2792743785).

Almost surely, 2^21594358073 is an apocalyptic number.

It is an amenable number.

21594358073 is a deficient number, since it is larger than the sum of its proper divisors (747592207).

21594358073 is an equidigital number, since it uses as much as digits as its factorization.

21594358073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98667.

The product of its (nonzero) digits is 907200, while the sum is 47.

The spelling of 21594358073 in words is "twenty-one billion, five hundred ninety-four million, three hundred fifty-eight thousand, seventy-three".