221231130401 has 4 divisors (see below), whose sum is σ = 228859790100. Its totient is φ = 213602470704.

The previous prime is 221231130359. The next prime is 221231130403. The reversal of 221231130401 is 104031132122.

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 167506844176 + 53724286225 = 409276^2 + 231785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221231130401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221231130403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3814329806 + ... + 3814329863.

It is an arithmetic number, because the mean of its divisors is an integer number (57214947525).

Almost surely, 2^221231130401 is an apocalyptic number.

It is an amenable number.

221231130401 is a deficient number, since it is larger than the sum of its proper divisors (7628659699).

221231130401 is an equidigital number, since it uses as much as digits as its factorization.

221231130401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7628659698.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 221231130401 its reverse (104031132122), we get a palindrome (325262262523).

The spelling of 221231130401 in words is "two hundred twenty-one billion, two hundred thirty-one million, one hundred thirty thousand, four hundred one".