13221660247 has 8 divisors (see below), whose sum is σ = 13368655872. Its totient is φ = 13075335000.

The previous prime is 13221660229. The next prime is 13221660341. The reversal of 13221660247 is 74206612231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13221660247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221660217) 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, 127879 + ... + 206872.

It is an arithmetic number, because the mean of its divisors is an integer number (1671081984).

Almost surely, 2^13221660247 is an apocalyptic number.

13221660247 is a deficient number, since it is larger than the sum of its proper divisors (146995625).

13221660247 is a wasteful number, since it uses less digits than its factorization.

13221660247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335189.

The product of its (nonzero) digits is 24192, while the sum is 34.

The spelling of 13221660247 in words is "thirteen billion, two hundred twenty-one million, six hundred sixty thousand, two hundred forty-seven".