221011101 has 24 divisors (see below), whose sum is σ = 347161464. Its totient is φ = 134922240.

The previous prime is 221011081. The next prime is 221011103. The reversal of 221011101 is 101110122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 163175076 + 57836025 = 12774^2 + 7605^2 .

It is not a de Polignac number, because 221011101 - 2⁹ = 221010589 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 (221011103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13860 + ... + 25181.

It is an arithmetic number, because the mean of its divisors is an integer number (14465061).

Almost surely, 2^221011101 is an apocalyptic number.

It is an amenable number.

221011101 is a deficient number, since it is larger than the sum of its proper divisors (126150363).

221011101 is a wasteful number, since it uses less digits than its factorization.

221011101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39101 (or 39098 counting only the distinct ones).

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

The square root of 221011101 is about 14866.4421096643. The cubic root of 221011101 is about 604.6044825117.

Adding to 221011101 its reverse (101110122), we get a palindrome (322121223).

It can be divided in two parts, 22 and 1011101, that multiplied together give a palindrome (22244222).

The spelling of 221011101 in words is "two hundred twenty-one million, eleven thousand, one hundred one".