221213343312123 has 4 divisors (see below), whose sum is σ = 294951124416168. Its totient is φ = 147475562208080.

The previous prime is 221213343312097. The next prime is 221213343312131. The reversal of 221213343312123 is 321213343312122.

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 221213343312123 - 2²⁸ = 221213074876667 is a prime.

It is a super-2 number, since 2×221213343312123² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221213343312133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36868890552018 + ... + 36868890552023.

It is an arithmetic number, because the mean of its divisors is an integer number (73737781104042).

Almost surely, 2^{221213343312123} is an apocalyptic number.

221213343312123 is a deficient number, since it is larger than the sum of its proper divisors (73737781104045).

221213343312123 is an equidigital number, since it uses as much as digits as its factorization.

221213343312123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73737781104044.

The product of its digits is 31104, while the sum is 33.

Adding to 221213343312123 its reverse (321213343312122), we get a palindrome (542426686624245).

Subtracting 221213343312123 from its reverse (321213343312122), we obtain a palindrome (99999999999999).

The spelling of 221213343312123 in words is "two hundred twenty-one trillion, two hundred thirteen billion, three hundred forty-three million, three hundred twelve thousand, one hundred twenty-three".