42401100221 has 2 divisors, whose sum is σ = 42401100222. Its totient is φ = 42401100220.

The previous prime is 42401100193. The next prime is 42401100233. The reversal of 42401100221 is 12200110424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27593860996 + 14807239225 = 166114^2 + 121685^2 .

It is a cyclic number.

It is not a de Polignac number, because 42401100221 - 2¹⁰ = 42401099197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42401100221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42401105221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21200550110 + 21200550111.

It is an arithmetic number, because the mean of its divisors is an integer number (21200550111).

Almost surely, 2^42401100221 is an apocalyptic number.

It is an amenable number.

42401100221 is a deficient number, since it is larger than the sum of its proper divisors (1).

42401100221 is an equidigital number, since it uses as much as digits as its factorization.

42401100221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 42401100221 its reverse (12200110424), we get a palindrome (54601210645).

The spelling of 42401100221 in words is "forty-two billion, four hundred one million, one hundred thousand, two hundred twenty-one".