221103121 has 8 divisors (see below), whose sum is σ = 227347560. Its totient is φ = 214935552.

The previous prime is 221103079. The next prime is 221103131. The reversal of 221103121 is 121301122.

It can be written as a sum of positive squares in 4 ways, for example, as 121881600 + 99221521 = 11040^2 + 9961^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221103121 - 2¹¹ = 221101073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221103131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13360 + ... + 24913.

It is an arithmetic number, because the mean of its divisors is an integer number (28418445).

Almost surely, 2^221103121 is an apocalyptic number.

It is an amenable number.

221103121 is a deficient number, since it is larger than the sum of its proper divisors (6244439).

221103121 is a wasteful number, since it uses less digits than its factorization.

221103121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38435.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 221103121 is about 14869.5366773817. The cubic root of 221103121 is about 604.6883817435.

Adding to 221103121 its reverse (121301122), we get a palindrome (342404243).

The spelling of 221103121 in words is "two hundred twenty-one million, one hundred three thousand, one hundred twenty-one".