12381720481 has 32 divisors (see below), whose sum is σ = 14290214400. Its totient is φ = 10633109760.

The previous prime is 12381720473. The next prime is 12381720493. The reversal of 12381720481 is 18402718321.

It is not a de Polignac number, because 12381720481 - 2³ = 12381720473 is a prime.

It is a super-2 number, since 2×12381720481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12381720481.

It is not an unprimeable number, because it can be changed into a prime (12381720181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3842451 + ... + 3845671.

It is an arithmetic number, because the mean of its divisors is an integer number (446569200).

Almost surely, 2^12381720481 is an apocalyptic number.

It is an amenable number.

12381720481 is a deficient number, since it is larger than the sum of its proper divisors (1908493919).

12381720481 is a wasteful number, since it uses less digits than its factorization.

12381720481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3529.

The product of its (nonzero) digits is 21504, while the sum is 37.

The spelling of 12381720481 in words is "twelve billion, three hundred eighty-one million, seven hundred twenty thousand, four hundred eighty-one".