12420156251 has 4 divisors (see below), whose sum is σ = 12426279600. Its totient is φ = 12414032904.

The previous prime is 12420156241. The next prime is 12420156253. The reversal of 12420156251 is 15265102421.

12420156251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12420156251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12420156253) 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 3 ways as a sum of consecutive naturals, for example, 3058631 + ... + 3062688.

It is an arithmetic number, because the mean of its divisors is an integer number (3106569900).

Almost surely, 2^12420156251 is an apocalyptic number.

12420156251 is a deficient number, since it is larger than the sum of its proper divisors (6123349).

12420156251 is an equidigital number, since it uses as much as digits as its factorization.

12420156251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6123348.

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 12420156251 its reverse (15265102421), we get a palindrome (27685258672).

The spelling of 12420156251 in words is "twelve billion, four hundred twenty million, one hundred fifty-six thousand, two hundred fifty-one".