221311434101 has 6 divisors (see below), whose sum is σ = 235095537570. Its totient is φ = 208293114176.

The previous prime is 221311434083. The next prime is 221311434109. The reversal of 221311434101 is 101434113122.

It can be written as a sum of positive squares in 3 ways, for example, as 28603603876 + 192707830225 = 169126^2 + 438985^2 .

It is not a de Polignac number, because 221311434101 - 2¹⁸ = 221311171957 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 (221311434109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 382891466 + ... + 382892043.

It is an arithmetic number, because the mean of its divisors is an integer number (39182589595).

Almost surely, 2^221311434101 is an apocalyptic number.

It is an amenable number.

221311434101 is a deficient number, since it is larger than the sum of its proper divisors (13784103469).

221311434101 is an equidigital number, since it uses as much as digits as its factorization.

221311434101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765783543 (or 765783526 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 221311434101 its reverse (101434113122), we get a palindrome (322745547223).

The spelling of 221311434101 in words is "two hundred twenty-one billion, three hundred eleven million, four hundred thirty-four thousand, one hundred one".