12126445431621 has 8 divisors (see below), whose sum is σ = 16183977922464. Its totient is φ = 8076604947600.

The previous prime is 12126445431587. The next prime is 12126445431673. The reversal of 12126445431621 is 12613454462121.

12126445431621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12126445431621 - 2⁶ = 12126445431557 is a prime.

It is a super-3 number, since 3×12126445431621³ (a number of 40 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12126445431421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1922998026 + ... + 1923004331.

It is an arithmetic number, because the mean of its divisors is an integer number (2022997240308).

Almost surely, 2^{12126445431621} is an apocalyptic number.

It is an amenable number.

12126445431621 is a deficient number, since it is larger than the sum of its proper divisors (4057532490843).

12126445431621 is a wasteful number, since it uses less digits than its factorization.

12126445431621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3846003411.

The product of its digits is 276480, while the sum is 42.

Adding to 12126445431621 its reverse (12613454462121), we get a palindrome (24739899893742).

The spelling of 12126445431621 in words is "twelve trillion, one hundred twenty-six billion, four hundred forty-five million, four hundred thirty-one thousand, six hundred twenty-one".