221101123 has 4 divisors (see below), whose sum is σ = 221899600. Its totient is φ = 220302648.

The previous prime is 221101117. The next prime is 221101129. The reversal of 221101123 is 321101122.

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

It is an interprime number because it is at equal distance from previous prime (221101117) and next prime (221101129).

It is a cyclic number.

It is not a de Polignac number, because 221101123 - 2⁵ = 221101091 is a prime.

It is a super-2 number, since 2×221101123² = 97771413183722258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221101129) 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, 398823 + ... + 399376.

It is an arithmetic number, because the mean of its divisors is an integer number (55474900).

Almost surely, 2^221101123 is an apocalyptic number.

221101123 is a deficient number, since it is larger than the sum of its proper divisors (798477).

221101123 is an equidigital number, since it uses as much as digits as its factorization.

221101123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798476.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 221101123 is about 14869.4694928905. The cubic root of 221101123 is about 604.6865603143.

Adding to 221101123 its reverse (321101122), we get a palindrome (542202245).

Subtracting 221101123 from its reverse (321101122), we obtain a palindrome (99999999).

The spelling of 221101123 in words is "two hundred twenty-one million, one hundred one thousand, one hundred twenty-three".