21392160345 has 20 divisors (see below), whose sum is σ = 38347428900. Its totient is φ = 11409151968.

The previous prime is 21392160301. The next prime is 21392160347. The reversal of 21392160345 is 54306129312.

21392160345 is a `hidden beast` number, since 2 + 1 + 3 + 9 + 2 + 1 + 603 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5187888729 + 16204271616 = 72027^2 + 127296^2 .

It is not a de Polignac number, because 21392160345 - 2¹⁶ = 21392094809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21392160347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 26409670 + ... + 26410479.

It is an arithmetic number, because the mean of its divisors is an integer number (1917371445).

Almost surely, 2^21392160345 is an apocalyptic number.

It is an amenable number.

21392160345 is a deficient number, since it is larger than the sum of its proper divisors (16955268555).

21392160345 is an equidigital number, since it uses as much as digits as its factorization.

21392160345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52820166 (or 52820157 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

Adding to 21392160345 its reverse (54306129312), we get a palindrome (75698289657).

The spelling of 21392160345 in words is "twenty-one billion, three hundred ninety-two million, one hundred sixty thousand, three hundred forty-five".