221301121 has 8 divisors (see below), whose sum is σ = 236394504. Its totient is φ = 206438400.

The previous prime is 221301103. The next prime is 221301127. The reversal of 221301121 is 121103122.

It can be written as a sum of positive squares in 4 ways, for example, as 2852721 + 218448400 = 1689^2 + 14780^2 .

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 221301121 - 2⁹ = 221300609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221301127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55680 + ... + 59521.

It is an arithmetic number, because the mean of its divisors is an integer number (29549313).

Almost surely, 2^221301121 is an apocalyptic number.

It is an amenable number.

221301121 is a deficient number, since it is larger than the sum of its proper divisors (15093383).

221301121 is a wasteful number, since it uses less digits than its factorization.

221301121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115331.

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

The square root of 221301121 is about 14876.1930950092. The cubic root of 221301121 is about 604.8688293366.

Adding to 221301121 its reverse (121103122), we get a palindrome (342404243).

The spelling of 221301121 in words is "two hundred twenty-one million, three hundred one thousand, one hundred twenty-one".