20121110311 has 4 divisors (see below), whose sum is σ = 20137563792. Its totient is φ = 20104656832.

The previous prime is 20121110297. The next prime is 20121110353. The reversal of 20121110311 is 11301112102.

It is a happy number.

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 20121110311 - 2¹¹ = 20121108263 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121110291 and 20121110300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121116311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8224906 + ... + 8227351.

It is an arithmetic number, because the mean of its divisors is an integer number (5034390948).

Almost surely, 2^20121110311 is an apocalyptic number.

20121110311 is a deficient number, since it is larger than the sum of its proper divisors (16453481).

20121110311 is a wasteful number, since it uses less digits than its factorization.

20121110311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16453480.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 20121110311 its reverse (11301112102), we get a palindrome (31422222413).

The spelling of 20121110311 in words is "twenty billion, one hundred twenty-one million, one hundred ten thousand, three hundred eleven".