221101211123 has 16 divisors (see below), whose sum is σ = 245818712832. Its totient is φ = 197486640000.

The previous prime is 221101211101. The next prime is 221101211141. The reversal of 221101211123 is 321112101122.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-221101211123 is a prime.

It is a super-2 number, since 2×221101211123² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221101211423) 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, 4059773 + ... + 4113873.

It is an arithmetic number, because the mean of its divisors is an integer number (15363669552).

Almost surely, 2^221101211123 is an apocalyptic number.

221101211123 is a deficient number, since it is larger than the sum of its proper divisors (24717501709).

221101211123 is a wasteful number, since it uses less digits than its factorization.

221101211123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64286.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 221101211123 its reverse (321112101122), we get a palindrome (542213312245).

The spelling of 221101211123 in words is "two hundred twenty-one billion, one hundred one million, two hundred eleven thousand, one hundred twenty-three".