221203234121 has 8 divisors (see below), whose sum is σ = 223865047560. Its totient is φ = 218552919552.

The previous prime is 221203234117. The next prime is 221203234151. The reversal of 221203234121 is 121432302122.

It can be written as a sum of positive squares in 4 ways, for example, as 117213108496 + 103990125625 = 342364^2 + 322475^2 .

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 221203234121 - 2² = 221203234117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221203234151) 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, 2836010 + ... + 2912963.

It is an arithmetic number, because the mean of its divisors is an integer number (27983130945).

Almost surely, 2^221203234121 is an apocalyptic number.

It is an amenable number.

221203234121 is a deficient number, since it is larger than the sum of its proper divisors (2661813439).

221203234121 is a wasteful number, since it uses less digits than its factorization.

221203234121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5749435.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 221203234121 its reverse (121432302122), we get a palindrome (342635536243).

The spelling of 221203234121 in words is "two hundred twenty-one billion, two hundred three million, two hundred thirty-four thousand, one hundred twenty-one".