203021320111 has 4 divisors (see below), whose sum is σ = 203025391072. Its totient is φ = 203017249152.

The previous prime is 203021320109. The next prime is 203021320127. The reversal of 203021320111 is 111023120302.

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

It is a cyclic number.

It is not a de Polignac number, because 203021320111 - 2¹ = 203021320109 is a prime.

It is a super-2 number, since 2×203021320111² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203021320511) 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 in 3 ways as a sum of consecutive naturals, for example, 1959735 + ... + 2060728.

It is an arithmetic number, because the mean of its divisors is an integer number (50756347768).

Almost surely, 2^203021320111 is an apocalyptic number.

203021320111 is a deficient number, since it is larger than the sum of its proper divisors (4070961).

203021320111 is an equidigital number, since it uses as much as digits as its factorization.

203021320111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4070960.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 203021320111 its reverse (111023120302), we get a palindrome (314044440413).

The spelling of 203021320111 in words is "two hundred three billion, twenty-one million, three hundred twenty thousand, one hundred eleven".