221641043413 has 2 divisors, whose sum is σ = 221641043414. Its totient is φ = 221641043412.

The previous prime is 221641043399. The next prime is 221641043443. The reversal of 221641043413 is 314340146122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201818374564 + 19822668849 = 449242^2 + 140793^2 .

It is a cyclic number.

It is not a de Polignac number, because 221641043413 - 2²⁹ = 221104172501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221641043443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110820521706 + 110820521707.

It is an arithmetic number, because the mean of its divisors is an integer number (110820521707).

Almost surely, 2^221641043413 is an apocalyptic number.

It is an amenable number.

221641043413 is a deficient number, since it is larger than the sum of its proper divisors (1).

221641043413 is an equidigital number, since it uses as much as digits as its factorization.

221641043413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 221641043413 its reverse (314340146122), we get a palindrome (535981189535).

The spelling of 221641043413 in words is "two hundred twenty-one billion, six hundred forty-one million, forty-three thousand, four hundred thirteen".