12120520065851 has 8 divisors (see below), whose sum is σ = 12974686958400. Its totient is φ = 11287977651720.

The previous prime is 12120520065811. The next prime is 12120520065919. The reversal of 12120520065851 is 15856002502121.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12120520065851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12120520065811) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5406118445 + ... + 5406120686.

It is an arithmetic number, because the mean of its divisors is an integer number (1621835869800).

Almost surely, 2^{12120520065851} is an apocalyptic number.

12120520065851 is a deficient number, since it is larger than the sum of its proper divisors (854166892549).

12120520065851 is a wasteful number, since it uses less digits than its factorization.

12120520065851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10812239209.

The product of its (nonzero) digits is 48000, while the sum is 38.

Adding to 12120520065851 its reverse (15856002502121), we get a palindrome (27976522567972).

The spelling of 12120520065851 in words is "twelve trillion, one hundred twenty billion, five hundred twenty million, sixty-five thousand, eight hundred fifty-one".