221404144121 has 8 divisors (see below), whose sum is σ = 221880400200. Its totient is φ = 220928296960.

The previous prime is 221404144109. The next prime is 221404144127. The reversal of 221404144121 is 121441404122.

It can be written as a sum of positive squares in 4 ways, for example, as 50698826896 + 170705317225 = 225164^2 + 413165^2 .

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 221404144121 - 2⁶ = 221404144057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221404144127) 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, 994415 + ... + 1196523.

It is an arithmetic number, because the mean of its divisors is an integer number (27735050025).

Almost surely, 2^221404144121 is an apocalyptic number.

It is an amenable number.

221404144121 is a deficient number, since it is larger than the sum of its proper divisors (476256079).

221404144121 is a wasteful number, since it uses less digits than its factorization.

221404144121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204459.

The product of its (nonzero) digits is 2048, while the sum is 26.

Adding to 221404144121 its reverse (121441404122), we get a palindrome (342845548243).

The spelling of 221404144121 in words is "two hundred twenty-one billion, four hundred four million, one hundred forty-four thousand, one hundred twenty-one".