12105755621 has 16 divisors (see below), whose sum is σ = 12688099200. Its totient is φ = 11535238848.

The previous prime is 12105755593. The next prime is 12105755633. The reversal of 12105755621 is 12655750121.

It is a cyclic number.

It is not a de Polignac number, because 12105755621 - 2¹⁰ = 12105754597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12105755021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 827456 + ... + 841958.

It is an arithmetic number, because the mean of its divisors is an integer number (793006200).

Almost surely, 2^12105755621 is an apocalyptic number.

It is an amenable number.

12105755621 is a deficient number, since it is larger than the sum of its proper divisors (582343579).

12105755621 is a wasteful number, since it uses less digits than its factorization.

12105755621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14908.

The product of its (nonzero) digits is 21000, while the sum is 35.

The spelling of 12105755621 in words is "twelve billion, one hundred five million, seven hundred fifty-five thousand, six hundred twenty-one".