21011113013031 has 10 divisors (see below), whose sum is σ = 31386971291192. Its totient is φ = 14007408675300.

The previous prime is 21011113013021. The next prime is 21011113013039. The reversal of 21011113013031 is 13031031111012.

It is not a de Polignac number, because 21011113013031 - 2¹¹ = 21011113010983 is a prime.

It is a super-2 number, since 2×21011113013031² (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 = 21011113012995 and 21011113013013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011113013039) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 129698228395 + ... + 129698228556.

Almost surely, 2^{21011113013031} is an apocalyptic number.

21011113013031 is a deficient number, since it is larger than the sum of its proper divisors (10375858278161).

21011113013031 is an equidigital number, since it uses as much as digits as its factorization.

21011113013031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259396456963 (or 259396456954 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

Adding to 21011113013031 its reverse (13031031111012), we get a palindrome (34042144124043).

The spelling of 21011113013031 in words is "twenty-one trillion, eleven billion, one hundred thirteen million, thirteen thousand, thirty-one".