221311110421 has 6 divisors (see below), whose sum is σ = 235095193730. Its totient is φ = 208292809536.

The previous prime is 221311110389. The next prime is 221311110469. The reversal of 221311110421 is 124011113122.

221311110421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 135947801521 + 85363308900 = 368711^2 + 292170^2 .

It is not a de Polignac number, because 221311110421 - 2⁵ = 221311110389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221311110521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 382890906 + ... + 382891483.

Almost surely, 2^221311110421 is an apocalyptic number.

It is an amenable number.

221311110421 is a deficient number, since it is larger than the sum of its proper divisors (13784083309).

221311110421 is an equidigital number, since it uses as much as digits as its factorization.

221311110421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765782423 (or 765782406 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 221311110421 its reverse (124011113122), we get a palindrome (345322223543).

The spelling of 221311110421 in words is "two hundred twenty-one billion, three hundred eleven million, one hundred ten thousand, four hundred twenty-one".