12561120426 has 8 divisors (see below), whose sum is σ = 25122240864. Its totient is φ = 4187040140.

The previous prime is 12561120413. The next prime is 12561120437. The reversal of 12561120426 is 62402116521.

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

12561120426 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 12561120393 and 12561120402.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1046760030 + ... + 1046760041.

It is an arithmetic number, because the mean of its divisors is an integer number (3140280108).

Almost surely, 2^12561120426 is an apocalyptic number.

12561120426 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12561120426 is a wasteful number, since it uses less digits than its factorization.

12561120426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2093520076.

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

Adding to 12561120426 its reverse (62402116521), we get a palindrome (74963236947).

The spelling of 12561120426 in words is "twelve billion, five hundred sixty-one million, one hundred twenty thousand, four hundred twenty-six".