221201111023 has 4 divisors (see below), whose sum is σ = 221236674408. Its totient is φ = 221165547640.

The previous prime is 221201110997. The next prime is 221201111029. The reversal of 221201111023 is 320111102122.

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-221201111023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221201110988 and 221201111006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221201111029) 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, 17772361 + ... + 17784802.

It is an arithmetic number, because the mean of its divisors is an integer number (55309168602).

Almost surely, 2^221201111023 is an apocalyptic number.

221201111023 is a deficient number, since it is larger than the sum of its proper divisors (35563385).

221201111023 is an equidigital number, since it uses as much as digits as its factorization.

221201111023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35563384.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 221201111023 its reverse (320111102122), we get a palindrome (541312213145).

The spelling of 221201111023 in words is "two hundred twenty-one billion, two hundred one million, one hundred eleven thousand, twenty-three".