12420156261 has 8 divisors (see below), whose sum is σ = 16562202624. Its totient is φ = 8279107040.

The previous prime is 12420156253. The next prime is 12420156283. The reversal of 12420156261 is 16265102421.

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 12420156261 - 2³ = 12420156253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12420156241) 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, 219720 + ... + 270401.

It is an arithmetic number, because the mean of its divisors is an integer number (2070275328).

Almost surely, 2^12420156261 is an apocalyptic number.

It is an amenable number.

12420156261 is a deficient number, since it is larger than the sum of its proper divisors (4142046363).

12420156261 is an equidigital number, since it uses as much as digits as its factorization.

12420156261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498571.

The product of its (nonzero) digits is 5760, while the sum is 30.

Adding to 12420156261 its reverse (16265102421), we get a palindrome (28685258682).

The spelling of 12420156261 in words is "twelve billion, four hundred twenty million, one hundred fifty-six thousand, two hundred sixty-one".