12020203004021 has 4 divisors (see below), whose sum is σ = 12021515692332. Its totient is φ = 12018890315712.

The previous prime is 12020203004009. The next prime is 12020203004023. The reversal of 12020203004021 is 12040030202021.

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 5177950311121 + 6842252692900 = 2275511^2 + 2615770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12020203004021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12020203004023) 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, 656330420 + ... + 656348733.

It is an arithmetic number, because the mean of its divisors is an integer number (3005378923083).

Almost surely, 2^{12020203004021} is an apocalyptic number.

It is an amenable number.

12020203004021 is a deficient number, since it is larger than the sum of its proper divisors (1312688311).

12020203004021 is an equidigital number, since it uses as much as digits as its factorization.

12020203004021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312688310.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 12020203004021 its reverse (12040030202021), we get a palindrome (24060233206042).

The spelling of 12020203004021 in words is "twelve trillion, twenty billion, two hundred three million, four thousand, twenty-one".