21513566341 has 8 divisors (see below), whose sum is σ = 22248168704. Its totient is φ = 20781502560.

The previous prime is 21513566311. The next prime is 21513566353. The reversal of 21513566341 is 14366531512.

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 21513566341 - 2⁵ = 21513566309 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21513566341.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21513566311) 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, 617400 + ... + 651313.

It is an arithmetic number, because the mean of its divisors is an integer number (2781021088).

Almost surely, 2^21513566341 is an apocalyptic number.

It is an amenable number.

21513566341 is a deficient number, since it is larger than the sum of its proper divisors (734602363).

21513566341 is a wasteful number, since it uses less digits than its factorization.

21513566341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1269291.

The product of its digits is 64800, while the sum is 37.

The spelling of 21513566341 in words is "twenty-one billion, five hundred thirteen million, five hundred sixty-six thousand, three hundred forty-one".