221303220311 has 4 divisors (see below), whose sum is σ = 221304694224. Its totient is φ = 221301746400.

The previous prime is 221303220277. The next prime is 221303220331. The reversal of 221303220311 is 113022303122.

221303220311 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221303220311 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 (221303220331) 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 3 ways as a sum of consecutive naturals, for example, 482435 + ... + 821796.

It is an arithmetic number, because the mean of its divisors is an integer number (55326173556).

Almost surely, 2^221303220311 is an apocalyptic number.

221303220311 is a deficient number, since it is larger than the sum of its proper divisors (1473913).

221303220311 is a wasteful number, since it uses less digits than its factorization.

221303220311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473912.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 221303220311 its reverse (113022303122), we get a palindrome (334325523433).

The spelling of 221303220311 in words is "two hundred twenty-one billion, three hundred three million, two hundred twenty thousand, three hundred eleven".