221236101 has 18 divisors (see below), whose sum is σ = 322677810. Its totient is φ = 146066976.

The previous prime is 221236027. The next prime is 221236117. The reversal of 221236101 is 101632122.

It can be written as a sum of positive squares in 3 ways, for example, as 34503876 + 186732225 = 5874^2 + 13665^2 .

It is not a de Polignac number, because 221236101 - 2⁹ = 221235589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221236201) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 105895 + ... + 107963.

It is an arithmetic number, because the mean of its divisors is an integer number (17926545).

Almost surely, 2^221236101 is an apocalyptic number.

It is an amenable number.

221236101 is a deficient number, since it is larger than the sum of its proper divisors (101441709).

221236101 is a wasteful number, since it uses less digits than its factorization.

221236101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2293 (or 2181 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 221236101 is about 14874.0075635318. The cubic root of 221236101 is about 604.8095851367.

Adding to 221236101 its reverse (101632122), we get a palindrome (322868223).

It can be divided in two parts, 22123 and 6101, that added together give a square (28224 = 168²).

The spelling of 221236101 in words is "two hundred twenty-one million, two hundred thirty-six thousand, one hundred one".