221011111111223 has 4 divisors (see below), whose sum is σ = 221028063729240. Its totient is φ = 220994158493208.

The previous prime is 221011111111207. The next prime is 221011111111229. The reversal of 221011111111223 is 322111111110122.

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 221011111111223 - 2⁴ = 221011111111207 is a prime.

It is a super-2 number, since 2×221011111111223² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221011111111195 and 221011111111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221011111111229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8476289453 + ... + 8476315526.

It is an arithmetic number, because the mean of its divisors is an integer number (55257015932310).

Almost surely, 2^{221011111111223} is an apocalyptic number.

221011111111223 is a deficient number, since it is larger than the sum of its proper divisors (16952618017).

221011111111223 is a wasteful number, since it uses less digits than its factorization.

221011111111223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16952618016.

The product of its (nonzero) digits is 48, while the sum is 20.

Adding to 221011111111223 its reverse (322111111110122), we get a palindrome (543122222221345).

The spelling of 221011111111223 in words is "two hundred twenty-one trillion, eleven billion, one hundred eleven million, one hundred eleven thousand, two hundred twenty-three".