12013112221 has 32 divisors (see below), whose sum is σ = 14306284800. Its totient is φ = 9972103680.

The previous prime is 12013112207. The next prime is 12013112231. The reversal of 12013112221 is 12221131021.

It is not a de Polignac number, because 12013112221 - 2¹³ = 12013104029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12013112195 and 12013112204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12013112231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 643795 + ... + 662191.

It is an arithmetic number, because the mean of its divisors is an integer number (447071400).

Almost surely, 2^12013112221 is an apocalyptic number.

12013112221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12013112221 is a deficient number, since it is larger than the sum of its proper divisors (2293172579).

12013112221 is a wasteful number, since it uses less digits than its factorization.

12013112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18549.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12013112221 its reverse (12221131021), we get a palindrome (24234243242).

The spelling of 12013112221 in words is "twelve billion, thirteen million, one hundred twelve thousand, two hundred twenty-one".