12013320121 has 4 divisors (see below), whose sum is σ = 13105440144. Its totient is φ = 10921200100.

The previous prime is 12013320107. The next prime is 12013320127. The reversal of 12013320121 is 12102331021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12013320121 - 2⁷ = 12013319993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12013320095 and 12013320104.

It is not an unprimeable number, because it can be changed into a prime (12013320127) 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, 546059995 + ... + 546060016.

It is an arithmetic number, because the mean of its divisors is an integer number (3276360036).

Almost surely, 2^12013320121 is an apocalyptic number.

12013320121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12013320121 is a deficient number, since it is larger than the sum of its proper divisors (1092120023).

12013320121 is a wasteful number, since it uses less digits than its factorization.

12013320121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092120022.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 12013320121 its reverse (12102331021), we get a palindrome (24115651142).

The spelling of 12013320121 in words is "twelve billion, thirteen million, three hundred twenty thousand, one hundred twenty-one".