20304121111 has 4 divisors (see below), whose sum is σ = 20315510512. Its totient is φ = 20292731712.

The previous prime is 20304121091. The next prime is 20304121153. The reversal of 20304121111 is 11112140302.

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 20304121111 - 2¹⁷ = 20303990039 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 (20304121811) 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 3 ways as a sum of consecutive naturals, for example, 5692026 + ... + 5695591.

It is an arithmetic number, because the mean of its divisors is an integer number (5078877628).

Almost surely, 2^20304121111 is an apocalyptic number.

20304121111 is a deficient number, since it is larger than the sum of its proper divisors (11389401).

20304121111 is a wasteful number, since it uses less digits than its factorization.

20304121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11389400.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 20304121111 its reverse (11112140302), we get a palindrome (31416261413).

The spelling of 20304121111 in words is "twenty billion, three hundred four million, one hundred twenty-one thousand, one hundred eleven".