21327198593 has 8 divisors (see below), whose sum is σ = 21426294312. Its totient is φ = 21228303616.

The previous prime is 21327198583. The next prime is 21327198631. The reversal of 21327198593 is 39589172312.

It can be written as a sum of positive squares in 4 ways, for example, as 424689664 + 20902508929 = 20608^2 + 144577^2 .

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 21327198593 - 2¹⁴ = 21327182209 is a prime.

It is a super-2 number, since 2×21327198593² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21327198583) 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, 164921 + ... + 264297.

It is an arithmetic number, because the mean of its divisors is an integer number (2678286789).

Almost surely, 2^21327198593 is an apocalyptic number.

It is an amenable number.

21327198593 is a deficient number, since it is larger than the sum of its proper divisors (99095719).

21327198593 is an equidigital number, since it uses as much as digits as its factorization.

21327198593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100371.

The product of its digits is 816480, while the sum is 50.

The spelling of 21327198593 in words is "twenty-one billion, three hundred twenty-seven million, one hundred ninety-eight thousand, five hundred ninety-three".