12020121012221 has 16 divisors (see below), whose sum is σ = 13904439416448. Its totient is φ = 10177621617600.

The previous prime is 12020121012217. The next prime is 12020121012241. The reversal of 12020121012221 is 12221012102021.

It is not a de Polignac number, because 12020121012221 - 2² = 12020121012217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12020121012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12020121012241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3693251 + ... + 6138431.

It is an arithmetic number, because the mean of its divisors is an integer number (869027463528).

Almost surely, 2^{12020121012221} is an apocalyptic number.

It is an amenable number.

12020121012221 is a deficient number, since it is larger than the sum of its proper divisors (1884318404227).

12020121012221 is an equidigital number, since it uses as much as digits as its factorization.

12020121012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2453732.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12020121012221 its reverse (12221012102021), we get a palindrome (24241133114242).

The spelling of 12020121012221 in words is "twelve trillion, twenty billion, one hundred twenty-one million, twelve thousand, two hundred twenty-one".