12121616216851 has 8 divisors (see below), whose sum is σ = 12649581172224. Its totient is φ = 11593729441800.

The previous prime is 12121616216849. The next prime is 12121616216881. The reversal of 12121616216851 is 15861261612121.

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 12121616216851 - 2¹ = 12121616216849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121616216798 and 12121616216807.

It is not an unprimeable number, because it can be changed into a prime (12121616216881) 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, 19228125 + ... + 19848526.

It is an arithmetic number, because the mean of its divisors is an integer number (1581197646528).

Almost surely, 2^{12121616216851} is an apocalyptic number.

12121616216851 is a deficient number, since it is larger than the sum of its proper divisors (527964955373).

12121616216851 is a wasteful number, since it uses less digits than its factorization.

12121616216851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39090161.

The product of its digits is 69120, while the sum is 43.

Adding to 12121616216851 its reverse (15861261612121), we get a palindrome (27982877828972).

The spelling of 12121616216851 in words is "twelve trillion, one hundred twenty-one billion, six hundred sixteen million, two hundred sixteen thousand, eight hundred fifty-one".