12121022021218 has 64 divisors (see below), whose sum is σ = 20007000000000. Its totient is φ = 5461771161600.

The previous prime is 12121022021177. The next prime is 12121022021219. The reversal of 12121022021218 is 81212022012121.

It is a junction number, because it is equal to n+sod(n) for n = 12121022021192 and 12121022021201.

It is not an unprimeable number, because it can be changed into a prime (12121022021219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6063541783 + ... + 6063543781.

It is an arithmetic number, because the mean of its divisors is an integer number (312609375000).

Almost surely, 2^{12121022021218} is an apocalyptic number.

12121022021218 is a deficient number, since it is larger than the sum of its proper divisors (7885977978782).

12121022021218 is a wasteful number, since it uses less digits than its factorization.

12121022021218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4891.

The product of its (nonzero) digits is 512, while the sum is 25.

Adding to 12121022021218 its reverse (81212022012121), we get a palindrome (93333044033339).

The spelling of 12121022021218 in words is "twelve trillion, one hundred twenty-one billion, twenty-two million, twenty-one thousand, two hundred eighteen".