221220011111123 has 4 divisors (see below), whose sum is σ = 221222443607880. Its totient is φ = 221217578614368.

The previous prime is 221220011111101. The next prime is 221220011111129. The reversal of 221220011111123 is 321111110022122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221220011111123 is a prime.

It is a super-2 number, since 2×221220011111123² (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 = 221220011111095 and 221220011111104.

It is not an unprimeable number, because it can be changed into a prime (221220011111129) 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, 1216111958 + ... + 1216293851.

It is an arithmetic number, because the mean of its divisors is an integer number (55305610901970).

Almost surely, 2^{221220011111123} is an apocalyptic number.

221220011111123 is a deficient number, since it is larger than the sum of its proper divisors (2432496757).

221220011111123 is an equidigital number, since it uses as much as digits as its factorization.

221220011111123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2432496756.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 221220011111123 its reverse (321111110022122), we get a palindrome (542331121133245).

The spelling of 221220011111123 in words is "two hundred twenty-one trillion, two hundred twenty billion, eleven million, one hundred eleven thousand, one hundred twenty-three".