221001101 has 4 divisors (see below), whose sum is σ = 222123132. Its totient is φ = 219879072.

The previous prime is 221001091. The next prime is 221001113. The reversal of 221001101 is 101100122.

221001101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 213306025 + 7695076 = 14605^2 + 2774^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221001101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221009101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 560720 + ... + 561113.

It is an arithmetic number, because the mean of its divisors is an integer number (55530783).

Almost surely, 2^221001101 is an apocalyptic number.

It is an amenable number.

221001101 is a deficient number, since it is larger than the sum of its proper divisors (1122031).

221001101 is a wasteful number, since it uses less digits than its factorization.

221001101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122030.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 221001101 is about 14866.1057779097. The cubic root of 221001101 is about 604.5953636092.

Adding to 221001101 its reverse (101100122), we get a palindrome (322101223).

The spelling of 221001101 in words is "two hundred twenty-one million, one thousand, one hundred one".