12061536721 has 8 divisors (see below), whose sum is σ = 13046572224. Its totient is φ = 11084676240.

The previous prime is 12061536713. The next prime is 12061536733. The reversal of 12061536721 is 12763516021.

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

It is a cyclic number.

It is not a de Polignac number, because 12061536721 - 2³ = 12061536713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12061536701) 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 7 ways as a sum of consecutive naturals, for example, 2040685 + ... + 2046586.

It is an arithmetic number, because the mean of its divisors is an integer number (1630821528).

Almost surely, 2^12061536721 is an apocalyptic number.

It is an amenable number.

12061536721 is a deficient number, since it is larger than the sum of its proper divisors (985035503).

12061536721 is a wasteful number, since it uses less digits than its factorization.

12061536721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4087511.

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 12061536721 in words is "twelve billion, sixty-one million, five hundred thirty-six thousand, seven hundred twenty-one".