13217220643 has 8 divisors (see below), whose sum is σ = 14431305456. Its totient is φ = 12005222400.

The previous prime is 13217220637. The next prime is 13217220691. The reversal of 13217220643 is 34602271231.

It is a happy number.

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 13217220643 - 2⁹ = 13217220131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13217226643) 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, 508378 + ... + 533743.

It is an arithmetic number, because the mean of its divisors is an integer number (1803913182).

Almost surely, 2^13217220643 is an apocalyptic number.

13217220643 is a deficient number, since it is larger than the sum of its proper divisors (1214084813).

13217220643 is a wasteful number, since it uses less digits than its factorization.

13217220643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043285.

The product of its (nonzero) digits is 12096, while the sum is 31.

Adding to 13217220643 its reverse (34602271231), we get a palindrome (47819491874).

The spelling of 13217220643 in words is "thirteen billion, two hundred seventeen million, two hundred twenty thousand, six hundred forty-three".