21373574312617 has 4 divisors (see below), whose sum is σ = 22302860152320. Its totient is φ = 20444288472916.

The previous prime is 21373574312603. The next prime is 21373574312641. The reversal of 21373574312617 is 71621347537312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21373574312617 is a prime.

It is a super-2 number, since 2×21373574312617² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21373574312647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464642919817 + ... + 464642919862.

It is an arithmetic number, because the mean of its divisors is an integer number (5575715038080).

Almost surely, 2^{21373574312617} is an apocalyptic number.

It is an amenable number.

21373574312617 is a deficient number, since it is larger than the sum of its proper divisors (929285839703).

21373574312617 is an equidigital number, since it uses as much as digits as its factorization.

21373574312617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929285839702.

The product of its digits is 4445280, while the sum is 52.

The spelling of 21373574312617 in words is "twenty-one trillion, three hundred seventy-three billion, five hundred seventy-four million, three hundred twelve thousand, six hundred seventeen".