12120420635 has 16 divisors (see below), whose sum is σ = 14616491232. Its totient is φ = 9648460800.

The previous prime is 12120420617. The next prime is 12120420643. The reversal of 12120420635 is 53602402121.

It is a happy number.

It is not a de Polignac number, because 12120420635 - 2²⁰ = 12119372059 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 888587 + ... + 902123.

It is an arithmetic number, because the mean of its divisors is an integer number (913530702).

Almost surely, 2^12120420635 is an apocalyptic number.

12120420635 is a deficient number, since it is larger than the sum of its proper divisors (2496070597).

12120420635 is a wasteful number, since it uses less digits than its factorization.

12120420635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14414.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 12120420635 its reverse (53602402121), we get a palindrome (65722822756).

The spelling of 12120420635 in words is "twelve billion, one hundred twenty million, four hundred twenty thousand, six hundred thirty-five".