20111011013 has 4 divisors (see below), whose sum is σ = 20113345440. Its totient is φ = 20108676588.

The previous prime is 20111011003. The next prime is 20111011051. The reversal of 20111011013 is 31011011102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20111011013 - 2⁶ = 20111010949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111010985 and 20111011003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111011003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1154243 + ... + 1171536.

It is an arithmetic number, because the mean of its divisors is an integer number (5028336360).

Almost surely, 2^20111011013 is an apocalyptic number.

It is an amenable number.

20111011013 is a deficient number, since it is larger than the sum of its proper divisors (2334427).

20111011013 is an equidigital number, since it uses as much as digits as its factorization.

20111011013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2334426.

The product of its (nonzero) digits is 6, while the sum is 11.

Adding to 20111011013 its reverse (31011011102), we get a palindrome (51122022115).

The spelling of 20111011013 in words is "twenty billion, one hundred eleven million, eleven thousand, thirteen".