12420155321 has 8 divisors (see below), whose sum is σ = 14244979584. Its totient is φ = 10607960160.

The previous prime is 12420155299. The next prime is 12420155357. The reversal of 12420155321 is 12355102421.

12420155321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12420155321 - 2⁶ = 12420155257 is a prime.

It is a super-2 number, since 2×12420155321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12420155221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3155165 + ... + 3159098.

It is an arithmetic number, because the mean of its divisors is an integer number (1780622448).

Almost surely, 2^12420155321 is an apocalyptic number.

It is an amenable number.

12420155321 is a deficient number, since it is larger than the sum of its proper divisors (1824824263).

12420155321 is an equidigital number, since it uses as much as digits as its factorization.

12420155321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6314551.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 12420155321 its reverse (12355102421), we get a palindrome (24775257742).

The spelling of 12420155321 in words is "twelve billion, four hundred twenty million, one hundred fifty-five thousand, three hundred twenty-one".