20011103211031 has 4 divisors (see below), whose sum is σ = 20881151176752. Its totient is φ = 19141055245312.

The previous prime is 20011103210929. The next prime is 20011103211061. The reversal of 20011103211031 is 13011230111002.

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 20011103211031 - 2²⁹ = 20010566340119 is a prime.

It is a super-2 number, since 2×20011103211031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011103210996 and 20011103211014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011103211061) 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, 435023982826 + ... + 435023982871.

It is an arithmetic number, because the mean of its divisors is an integer number (5220287794188).

Almost surely, 2^{20011103211031} is an apocalyptic number.

20011103211031 is a deficient number, since it is larger than the sum of its proper divisors (870047965721).

20011103211031 is an equidigital number, since it uses as much as digits as its factorization.

20011103211031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870047965720.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 20011103211031 its reverse (13011230111002), we get a palindrome (33022333322033).

The spelling of 20011103211031 in words is "twenty trillion, eleven billion, one hundred three million, two hundred eleven thousand, thirty-one".