21617313601 has 4 divisors (see below), whose sum is σ = 23280183892. Its totient is φ = 19954443312.

The previous prime is 21617313587. The next prime is 21617313647. The reversal of 21617313601 is 10631371612.

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 9374112400 + 12243201201 = 96820^2 + 110649^2 .

It is a cyclic number.

It is not a de Polignac number, because 21617313601 - 2⁵ = 21617313569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21617313671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 831435126 + ... + 831435151.

It is an arithmetic number, because the mean of its divisors is an integer number (5820045973).

Almost surely, 2^21617313601 is an apocalyptic number.

It is an amenable number.

21617313601 is a deficient number, since it is larger than the sum of its proper divisors (1662870291).

21617313601 is a wasteful number, since it uses less digits than its factorization.

21617313601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662870290.

The product of its (nonzero) digits is 4536, while the sum is 31.

The spelling of 21617313601 in words is "twenty-one billion, six hundred seventeen million, three hundred thirteen thousand, six hundred one".