12013322221 has 12 divisors (see below), whose sum is σ = 13002357492. Its totient is φ = 11093308928.

The previous prime is 12013322201. The next prime is 12013322267. The reversal of 12013322221 is 12222331021.

It can be written as a sum of positive squares in 6 ways, for example, as 5290962121 + 6722360100 = 72739^2 + 81990^2 .

It is not a de Polignac number, because 12013322221 - 2⁷ = 12013322093 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 (12013322201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 376840 + ... + 407473.

It is an arithmetic number, because the mean of its divisors is an integer number (1083529791).

Almost surely, 2^12013322221 is an apocalyptic number.

It is an amenable number.

12013322221 is a deficient number, since it is larger than the sum of its proper divisors (989035271).

12013322221 is an equidigital number, since it uses as much as digits as its factorization.

12013322221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784400 (or 784383 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 12013322221 its reverse (12222331021), we get a palindrome (24235653242).

The spelling of 12013322221 in words is "twelve billion, thirteen million, three hundred twenty-two thousand, two hundred twenty-one".