221241221401 has 2 divisors, whose sum is σ = 221241221402. Its totient is φ = 221241221400.

The previous prime is 221241221339. The next prime is 221241221417. The reversal of 221241221401 is 104122142122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192983611401 + 28257610000 = 439299^2 + 168100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221241221401 is a prime.

It is not a weakly prime, because it can be changed into another prime (221241221431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110620610700 + 110620610701.

It is an arithmetic number, because the mean of its divisors is an integer number (110620610701).

Almost surely, 2^221241221401 is an apocalyptic number.

It is an amenable number.

221241221401 is a deficient number, since it is larger than the sum of its proper divisors (1).

221241221401 is an equidigital number, since it uses as much as digits as its factorization.

221241221401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 221241221401 its reverse (104122142122), we get a palindrome (325363363523).

The spelling of 221241221401 in words is "two hundred twenty-one billion, two hundred forty-one million, two hundred twenty-one thousand, four hundred one".