20303121111 has 128 divisors (see below), whose sum is σ = 35287074816. Its totient is φ = 10100090880.

The previous prime is 20303121109. The next prime is 20303121229. The reversal of 20303121111 is 11112130302.

It is a happy number.

It is not a de Polignac number, because 20303121111 - 2¹ = 20303121109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20303123111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 51141165 + ... + 51141561.

It is an arithmetic number, because the mean of its divisors is an integer number (275680272).

Almost surely, 2^20303121111 is an apocalyptic number.

20303121111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20303121111 is a deficient number, since it is larger than the sum of its proper divisors (14983953705).

20303121111 is a wasteful number, since it uses less digits than its factorization.

20303121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 20303121111 its reverse (11112130302), we get a palindrome (31415251413).

The spelling of 20303121111 in words is "twenty billion, three hundred three million, one hundred twenty-one thousand, one hundred eleven".