21111131233 has 24 divisors (see below), whose sum is σ = 23458533120. Its totient is φ = 18958748160.

The previous prime is 21111131231. The next prime is 21111131269. The reversal of 21111131233 is 33213111112.

It is not a de Polignac number, because 21111131233 - 2¹ = 21111131231 is a prime.

It is a super-3 number, since 3×21111131233³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21111131233.

It is not an unprimeable number, because it can be changed into a prime (21111131231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2861173 + ... + 2868541.

It is an arithmetic number, because the mean of its divisors is an integer number (977438880).

Almost surely, 2^21111131233 is an apocalyptic number.

21111131233 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21111131233 is a deficient number, since it is larger than the sum of its proper divisors (2347401887).

21111131233 is a wasteful number, since it uses less digits than its factorization.

21111131233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7857 (or 7840 counting only the distinct ones).

The product of its digits is 108, while the sum is 19.

Adding to 21111131233 its reverse (33213111112), we get a palindrome (54324242345).

The spelling of 21111131233 in words is "twenty-one billion, one hundred eleven million, one hundred thirty-one thousand, two hundred thirty-three".