20101131111013 has 4 divisors (see below), whose sum is σ = 20169735654348. Its totient is φ = 20032526567680.

The previous prime is 20101131110999. The next prime is 20101131111043. The reversal of 20101131111013 is 31011113110102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16359622358209 + 3741508752804 = 4044703^2 + 1934298^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101131111013 - 2²⁵ = 20101097556581 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 (20101131111043) 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, 34302271228 + ... + 34302271813.

It is an arithmetic number, because the mean of its divisors is an integer number (5042433913587).

Almost surely, 2^{20101131111013} is an apocalyptic number.

It is an amenable number.

20101131111013 is a deficient number, since it is larger than the sum of its proper divisors (68604543335).

20101131111013 is an equidigital number, since it uses as much as digits as its factorization.

20101131111013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68604543334.

The product of its (nonzero) digits is 18, while the sum is 16.

Adding to 20101131111013 its reverse (31011113110102), we get a palindrome (51112244221115).

The spelling of 20101131111013 in words is "twenty trillion, one hundred one billion, one hundred thirty-one million, one hundred eleven thousand, thirteen".