21101113111231 has 4 divisors (see below), whose sum is σ = 21193257710200. Its totient is φ = 21008968512264.

The previous prime is 21101113111219. The next prime is 21101113111241. The reversal of 21101113111231 is 13211131110112.

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 21101113111231 - 2⁹ = 21101113110719 is a prime.

It is a super-2 number, since 2×21101113111231² (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 = 21101113111199 and 21101113111208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101113111241) 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, 46072299141 + ... + 46072299598.

It is an arithmetic number, because the mean of its divisors is an integer number (5298314427550).

Almost surely, 2^{21101113111231} is an apocalyptic number.

21101113111231 is a deficient number, since it is larger than the sum of its proper divisors (92144598969).

21101113111231 is an equidigital number, since it uses as much as digits as its factorization.

21101113111231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92144598968.

The product of its (nonzero) digits is 36, while the sum is 19.

Adding to 21101113111231 its reverse (13211131110112), we get a palindrome (34312244221343).

The spelling of 21101113111231 in words is "twenty-one trillion, one hundred one billion, one hundred thirteen million, one hundred eleven thousand, two hundred thirty-one".