12012020121221 has 8 divisors (see below), whose sum is σ = 12030078965400. Its totient is φ = 11993962210048.

The previous prime is 12012020121203. The next prime is 12012020121229. The reversal of 12012020121221 is 12212102021021.

It can be written as a sum of positive squares in 4 ways, for example, as 8401963120996 + 3610057000225 = 2898614^2 + 1900015^2 .

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 12012020121221 - 2²² = 12012015926917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12012020121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012020121229) 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, 28119785 + ... + 28543761.

It is an arithmetic number, because the mean of its divisors is an integer number (1503759870675).

Almost surely, 2^{12012020121221} is an apocalyptic number.

It is an amenable number.

12012020121221 is a deficient number, since it is larger than the sum of its proper divisors (18058844179).

12012020121221 is an equidigital number, since it uses as much as digits as its factorization.

12012020121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466503.

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

Adding to 12012020121221 its reverse (12212102021021), we get a palindrome (24224122142242).

The spelling of 12012020121221 in words is "twelve trillion, twelve billion, twenty million, one hundred twenty-one thousand, two hundred twenty-one".