20131112011 has 4 divisors (see below), whose sum is σ = 20289624832. Its totient is φ = 19972599192.

The previous prime is 20131111993. The next prime is 20131112063. The reversal of 20131112011 is 11021113102.

It is a happy number.

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-20131112011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20131111982 and 20131112000.

It is not an unprimeable number, because it can be changed into a prime (20131113011) 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, 79256220 + ... + 79256473.

It is an arithmetic number, because the mean of its divisors is an integer number (5072406208).

Almost surely, 2^20131112011 is an apocalyptic number.

20131112011 is a deficient number, since it is larger than the sum of its proper divisors (158512821).

20131112011 is a wasteful number, since it uses less digits than its factorization.

20131112011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158512820.

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

Adding to 20131112011 its reverse (11021113102), we get a palindrome (31152225113).

The spelling of 20131112011 in words is "twenty billion, one hundred thirty-one million, one hundred twelve thousand, eleven".