12720321115 has 8 divisors (see below), whose sum is σ = 16067774160. Its totient is φ = 9640664352.

The previous prime is 12720321101. The next prime is 12720321121. The reversal of 12720321115 is 51112302721.

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 12720321115 - 2⁹ = 12720320603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12720321115.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66948964 + ... + 66949153.

It is an arithmetic number, because the mean of its divisors is an integer number (2008471770).

Almost surely, 2^12720321115 is an apocalyptic number.

12720321115 is a deficient number, since it is larger than the sum of its proper divisors (3347453045).

12720321115 is a wasteful number, since it uses less digits than its factorization.

12720321115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133898141.

The product of its (nonzero) digits is 840, while the sum is 25.

Adding to 12720321115 its reverse (51112302721), we get a palindrome (63832623836).

The spelling of 12720321115 in words is "twelve billion, seven hundred twenty million, three hundred twenty-one thousand, one hundred fifteen".