221266662123 has 8 divisors (see below), whose sum is σ = 317716232848. Its totient is φ = 136164099744.

The previous prime is 221266662121. The next prime is 221266662161. The reversal of 221266662123 is 321266662122.

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

It is not a de Polignac number, because 221266662123 - 2¹ = 221266662121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 5673504157 = 221266662123 / (2 + 2 + 1 + 2 + 6 + 6 + 6 + 6 + 2 + 1 + 2 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221266662121) 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, 2836752040 + ... + 2836752117.

It is an arithmetic number, because the mean of its divisors is an integer number (39714529106).

Almost surely, 2^221266662123 is an apocalyptic number.

221266662123 is a deficient number, since it is larger than the sum of its proper divisors (96449570725).

221266662123 is a wasteful number, since it uses less digits than its factorization.

221266662123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5673504173.

The product of its digits is 124416, while the sum is 39.

Subtracting 221266662123 from its reverse (321266662122), we obtain a palindrome (99999999999).

The spelling of 221266662123 in words is "two hundred twenty-one billion, two hundred sixty-six million, six hundred sixty-two thousand, one hundred twenty-three".