11660444451221 has 8 divisors (see below), whose sum is σ = 11847344400000. Its totient is φ = 11474786363040.

The previous prime is 11660444451217. The next prime is 11660444451251. The reversal of 11660444451221 is 12215444406611.

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 11660444451221 - 2² = 11660444451217 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 (11660444451251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 310446221 + ... + 310483778.

It is an arithmetic number, because the mean of its divisors is an integer number (1480918050000).

Almost surely, 2^{11660444451221} is an apocalyptic number.

It is an amenable number.

11660444451221 is a deficient number, since it is larger than the sum of its proper divisors (186899948779).

11660444451221 is an equidigital number, since it uses as much as digits as its factorization.

11660444451221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620930299.

The product of its (nonzero) digits is 184320, while the sum is 41.

Adding to 11660444451221 its reverse (12215444406611), we get a palindrome (23875888857832).

The spelling of 11660444451221 in words is "eleven trillion, six hundred sixty billion, four hundred forty-four million, four hundred fifty-one thousand, two hundred twenty-one".