21374325615617 has 4 divisors (see below), whose sum is σ = 23018504509140. Its totient is φ = 19730146722096.

The previous prime is 21374325615583. The next prime is 21374325615641. The reversal of 21374325615617 is 71651652347312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8372596879936 + 13001728735681 = 2893544^2 + 3605791^2 .

It is a cyclic number.

It is not a de Polignac number, because 21374325615617 - 2⁶ = 21374325615553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21374325615677) 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 3 ways as a sum of consecutive naturals, for example, 822089446742 + ... + 822089446767.

It is an arithmetic number, because the mean of its divisors is an integer number (5754626127285).

Almost surely, 2^{21374325615617} is an apocalyptic number.

It is an amenable number.

21374325615617 is a deficient number, since it is larger than the sum of its proper divisors (1644178893523).

21374325615617 is a wasteful number, since it uses less digits than its factorization.

21374325615617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644178893522.

The product of its digits is 6350400, while the sum is 53.

The spelling of 21374325615617 in words is "twenty-one trillion, three hundred seventy-four billion, three hundred twenty-five million, six hundred fifteen thousand, six hundred seventeen".