221211101022123 has 4 divisors (see below), whose sum is σ = 294948134696168. Its totient is φ = 147474067348080.

The previous prime is 221211101022113. The next prime is 221211101022173. The reversal of 221211101022123 is 321220101112122.

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

It is not a de Polignac number, because 221211101022123 - 2²¹ = 221211098924971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221211101022123.

It is not an unprimeable number, because it can be changed into a prime (221211101022113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36868516837018 + ... + 36868516837023.

It is an arithmetic number, because the mean of its divisors is an integer number (73737033674042).

Almost surely, 2^{221211101022123} is an apocalyptic number.

221211101022123 is a deficient number, since it is larger than the sum of its proper divisors (73737033674045).

221211101022123 is an equidigital number, since it uses as much as digits as its factorization.

221211101022123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73737033674044.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 221211101022123 its reverse (321220101112122), we get a palindrome (542431202134245).

The spelling of 221211101022123 in words is "two hundred twenty-one trillion, two hundred eleven billion, one hundred one million, twenty-two thousand, one hundred twenty-three".