12730421561 has 16 divisors (see below), whose sum is σ = 15015647808. Its totient is φ = 10640280000.

The previous prime is 12730421527. The next prime is 12730421569. The reversal of 12730421561 is 16512403721.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12730421561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12730421569) 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, 141446 + ... + 213231.

It is an arithmetic number, because the mean of its divisors is an integer number (938477988).

Almost surely, 2^12730421561 is an apocalyptic number.

12730421561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12730421561 is a deficient number, since it is larger than the sum of its proper divisors (2285226247).

12730421561 is a wasteful number, since it uses less digits than its factorization.

12730421561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354952.

The product of its (nonzero) digits is 10080, while the sum is 32.

The spelling of 12730421561 in words is "twelve billion, seven hundred thirty million, four hundred twenty-one thousand, five hundred sixty-one".