12111321405 has 32 divisors (see below), whose sum is σ = 19641678336. Its totient is φ = 6371756864.

The previous prime is 12111321377. The next prime is 12111321413. The reversal of 12111321405 is 50412311121.

12111321405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12111321405 - 2¹⁴ = 12111305021 is a prime.

It is a super-2 number, since 2×12111321405² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 843214 + ... + 857456.

It is an arithmetic number, because the mean of its divisors is an integer number (613802448).

Almost surely, 2^12111321405 is an apocalyptic number.

12111321405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12111321405 is a deficient number, since it is larger than the sum of its proper divisors (7530356931).

12111321405 is a wasteful number, since it uses less digits than its factorization.

12111321405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15017.

The product of its (nonzero) digits is 240, while the sum is 21.

Adding to 12111321405 its reverse (50412311121), we get a palindrome (62523632526).

The spelling of 12111321405 in words is "twelve billion, one hundred eleven million, three hundred twenty-one thousand, four hundred five".