221101101 has 12 divisors (see below), whose sum is σ = 343935228. Its totient is φ = 136062144.

The previous prime is 221101091. The next prime is 221101117. The reversal of 221101101 is 101101122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 142778601 + 78322500 = 11949^2 + 8850^2 .

It is not a de Polignac number, because 221101101 - 2⁷ = 221100973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221101501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 944760 + ... + 944993.

It is an arithmetic number, because the mean of its divisors is an integer number (28661269).

Almost surely, 2^221101101 is an apocalyptic number.

It is an amenable number.

221101101 is a deficient number, since it is larger than the sum of its proper divisors (122834127).

221101101 is a wasteful number, since it uses less digits than its factorization.

221101101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889772 (or 1889769 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 221101101 is about 14869.4687531196. The cubic root of 221101101 is about 604.6865402585.

Adding to 221101101 its reverse (101101122), we get a palindrome (322202223).

The spelling of 221101101 in words is "two hundred twenty-one million, one hundred one thousand, one hundred one".