221066660123 has 4 divisors (see below), whose sum is σ = 221073393528. Its totient is φ = 221059926720.

The previous prime is 221066660107. The next prime is 221066660147. The reversal of 221066660123 is 321066660122.

It is a happy number.

221066660123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221066660123 - 2⁴ = 221066660107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221066665123) 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 3 ways as a sum of consecutive naturals, for example, 3317213 + ... + 3383198.

It is an arithmetic number, because the mean of its divisors is an integer number (55268348382).

Almost surely, 2^221066660123 is an apocalyptic number.

221066660123 is a deficient number, since it is larger than the sum of its proper divisors (6733405).

221066660123 is an equidigital number, since it uses as much as digits as its factorization.

221066660123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6733404.

The product of its (nonzero) digits is 31104, while the sum is 35.

Subtracting 221066660123 from its reverse (321066660122), we obtain a palindrome (99999999999).

The spelling of 221066660123 in words is "two hundred twenty-one billion, sixty-six million, six hundred sixty thousand, one hundred twenty-three".