12005505321 has 32 divisors (see below), whose sum is σ = 16357386240. Its totient is φ = 7830748800.

The previous prime is 12005505307. The next prime is 12005505331. The reversal of 12005505321 is 12350550021.

It is a happy number.

It is not a de Polignac number, because 12005505321 - 2⁶ = 12005505257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12005505291 and 12005505300.

It is not an unprimeable number, because it can be changed into a prime (12005505331) 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, 24450886 + ... + 24451376.

It is an arithmetic number, because the mean of its divisors is an integer number (511168320).

Almost surely, 2^12005505321 is an apocalyptic number.

It is an amenable number.

12005505321 is a deficient number, since it is larger than the sum of its proper divisors (4351880919).

12005505321 is a wasteful number, since it uses less digits than its factorization.

12005505321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237.

The product of its (nonzero) digits is 1500, while the sum is 24.

The spelling of 12005505321 in words is "twelve billion, five million, five hundred five thousand, three hundred twenty-one".