221311312203 has 16 divisors (see below), whose sum is σ = 306419684256. Its totient is φ = 141970498560.

The previous prime is 221311312063. The next prime is 221311312223. The reversal of 221311312203 is 302213113122.

221311312203 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221311312203 - 2⁹ = 221311311691 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221311312203.

It is not an unprimeable number, because it can be changed into a prime (221311312223) 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 15 ways as a sum of consecutive naturals, for example, 12314850 + ... + 12332807.

It is an arithmetic number, because the mean of its divisors is an integer number (19151230266).

Almost surely, 2^221311312203 is an apocalyptic number.

221311312203 is a deficient number, since it is larger than the sum of its proper divisors (85108372053).

221311312203 is a wasteful number, since it uses less digits than its factorization.

221311312203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24647774.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 221311312203 its reverse (302213113122), we get a palindrome (523524425325).

The spelling of 221311312203 in words is "two hundred twenty-one billion, three hundred eleven million, three hundred twelve thousand, two hundred three".