12015404121 has 24 divisors (see below), whose sum is σ = 18891443424. Its totient is φ = 6771885120.

The previous prime is 12015404059. The next prime is 12015404183. The reversal of 12015404121 is 12140451021.

It is an interprime number because it is at equal distance from previous prime (12015404059) and next prime (12015404183).

It is not a de Polignac number, because 12015404121 - 2¹¹ = 12015402073 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (12015404021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 549115 + ... + 570576.

It is an arithmetic number, because the mean of its divisors is an integer number (787143476).

Almost surely, 2^12015404121 is an apocalyptic number.

It is an amenable number.

12015404121 is a deficient number, since it is larger than the sum of its proper divisors (6876039303).

12015404121 is a wasteful number, since it uses less digits than its factorization.

12015404121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119781 (or 1119774 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 12015404121 its reverse (12140451021), we get a palindrome (24155855142).

The spelling of 12015404121 in words is "twelve billion, fifteen million, four hundred four thousand, one hundred twenty-one".