12020122211021 has 4 divisors (see below), whose sum is σ = 12727188223452. Its totient is φ = 11313056198592.

The previous prime is 12020122211017. The next prime is 12020122211143. The reversal of 12020122211021 is 12011222102021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8145972433225 + 3874149777796 = 2854115^2 + 1968286^2 .

It is a cyclic number.

It is not a de Polignac number, because 12020122211021 - 2² = 12020122211017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 707066012413 = 12020122211021 / (1 + 2 + 0 + 2 + 0 + 1 + 2 + 2 + 2 + 1 + 1 + 0 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12020122211821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353533006190 + ... + 353533006223.

It is an arithmetic number, because the mean of its divisors is an integer number (3181797055863).

Almost surely, 2^{12020122211021} is an apocalyptic number.

It is an amenable number.

12020122211021 is a deficient number, since it is larger than the sum of its proper divisors (707066012431).

12020122211021 is an equidigital number, since it uses as much as digits as its factorization.

12020122211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707066012430.

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

Adding to 12020122211021 its reverse (12011222102021), we get a palindrome (24031344313042).

The spelling of 12020122211021 in words is "twelve trillion, twenty billion, one hundred twenty-two million, two hundred eleven thousand, twenty-one".