12020010221 has 4 divisors (see below), whose sum is σ = 12313181244. Its totient is φ = 11726839200.

The previous prime is 12020010209. The next prime is 12020010227. The reversal of 12020010221 is 12201002021.

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: 12201002021 = 13 ⋅938538617.

It can be written as a sum of positive squares in 2 ways, for example, as 2518634596 + 9501375625 = 50186^2 + 97475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12020010221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12020010227) 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, 146585450 + ... + 146585531.

It is an arithmetic number, because the mean of its divisors is an integer number (3078295311).

Almost surely, 2^12020010221 is an apocalyptic number.

It is an amenable number.

12020010221 is a deficient number, since it is larger than the sum of its proper divisors (293171023).

12020010221 is an equidigital number, since it uses as much as digits as its factorization.

12020010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293171022.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12020010221 its reverse (12201002021), we get a palindrome (24221012242).

The spelling of 12020010221 in words is "twelve billion, twenty million, ten thousand, two hundred twenty-one".