12020231021 has 4 divisors (see below), whose sum is σ = 12727303452. Its totient is φ = 11313158592.

The previous prime is 12020230973. The next prime is 12020231023. The reversal of 12020231021 is 12013202021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12013202021 = 47 ⋅255600043.

It can be written as a sum of positive squares in 2 ways, for example, as 10135455625 + 1884775396 = 100675^2 + 43414^2 .

It is a cyclic number.

It is not a de Polignac number, because 12020231021 - 2²⁶ = 11953122157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12020230987 and 12020231005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12020231023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353536190 + ... + 353536223.

It is an arithmetic number, because the mean of its divisors is an integer number (3181825863).

Almost surely, 2^12020231021 is an apocalyptic number.

It is an amenable number.

12020231021 is a deficient number, since it is larger than the sum of its proper divisors (707072431).

12020231021 is an equidigital number, since it uses as much as digits as its factorization.

12020231021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707072430.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 12020231021 its reverse (12013202021), we get a palindrome (24033433042).

The spelling of 12020231021 in words is "twelve billion, twenty million, two hundred thirty-one thousand, twenty-one".