20131111031021 has 8 divisors (see below), whose sum is σ = 20857474753920. Its totient is φ = 19406893140208.

The previous prime is 20131111030981. The next prime is 20131111031027. The reversal of 20131111031021 is 12013011113102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20131111031021 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 (20131111031027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 536438921 + ... + 536476446.

It is an arithmetic number, because the mean of its divisors is an integer number (2607184344240).

Almost surely, 2^{20131111031021} is an apocalyptic number.

It is an amenable number.

20131111031021 is a deficient number, since it is larger than the sum of its proper divisors (726363722899).

20131111031021 is a wasteful number, since it uses less digits than its factorization.

20131111031021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072916043.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 20131111031021 its reverse (12013011113102), we get a palindrome (32144122144123).

The spelling of 20131111031021 in words is "twenty trillion, one hundred thirty-one billion, one hundred eleven million, thirty-one thousand, twenty-one".