12002031221 has 4 divisors (see below), whose sum is σ = 12007295244. Its totient is φ = 11996767200.

The previous prime is 12002031211. The next prime is 12002031247. The reversal of 12002031221 is 12213020021.

It is a happy number.

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 5503414225 + 6498616996 = 74185^2 + 80614^2 .

It is a cyclic number.

It is not a de Polignac number, because 12002031221 - 2¹⁰ = 12002030197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12002031196 and 12002031205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12002031211) 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, 2628590 + ... + 2633151.

It is an arithmetic number, because the mean of its divisors is an integer number (3001823811).

Almost surely, 2^12002031221 is an apocalyptic number.

It is an amenable number.

12002031221 is a deficient number, since it is larger than the sum of its proper divisors (5264023).

12002031221 is an equidigital number, since it uses as much as digits as its factorization.

12002031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5264022.

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

Adding to 12002031221 its reverse (12213020021), we get a palindrome (24215051242).

The spelling of 12002031221 in words is "twelve billion, two million, thirty-one thousand, two hundred twenty-one".