221101101123 has 16 divisors (see below), whose sum is σ = 337068969216. Its totient is φ = 126286109280.

The previous prime is 221101101101. The next prime is 221101101127. The reversal of 221101101123 is 321101101122.

It is not a de Polignac number, because 221101101123 - 2⁶ = 221101101059 is a prime.

It is a super-2 number, since 2×221101101123² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221101101127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2343348 + ... + 2435873.

It is an arithmetic number, because the mean of its divisors is an integer number (21066810576).

Almost surely, 2^221101101123 is an apocalyptic number.

221101101123 is a deficient number, since it is larger than the sum of its proper divisors (115967868093).

221101101123 is a wasteful number, since it uses less digits than its factorization.

221101101123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4781434.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 221101101123 its reverse (321101101122), we get a palindrome (542202202245).

Subtracting 221101101123 from its reverse (321101101122), we obtain a palindrome (99999999999).

The spelling of 221101101123 in words is "two hundred twenty-one billion, one hundred one million, one hundred one thousand, one hundred twenty-three".