12138377883621 has 32 divisors (see below), whose sum is σ = 18225988177920. Its totient is φ = 7119039801600.

The previous prime is 12138377883617. The next prime is 12138377883647. The reversal of 12138377883621 is 12638877383121.

It is not a de Polignac number, because 12138377883621 - 2² = 12138377883617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12138377883221) 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, 32271786 + ... + 32645748.

It is an arithmetic number, because the mean of its divisors is an integer number (569562130560).

Almost surely, 2^{12138377883621} is an apocalyptic number.

12138377883621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12138377883621 is a deficient number, since it is larger than the sum of its proper divisors (6087610294299).

12138377883621 is a wasteful number, since it uses less digits than its factorization.

12138377883621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405737.

The product of its digits is 16257024, while the sum is 60.

The spelling of 12138377883621 in words is "twelve trillion, one hundred thirty-eight billion, three hundred seventy-seven million, eight hundred eighty-three thousand, six hundred twenty-one".