21233113111 has 12 divisors (see below), whose sum is σ = 25999731480. Its totient is φ = 17241925680.

The previous prime is 21233113103. The next prime is 21233113117. The reversal of 21233113111 is 11131133212.

It is not a de Polignac number, because 21233113111 - 2³ = 21233113103 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233113117) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11402460 + ... + 11404321.

It is an arithmetic number, because the mean of its divisors is an integer number (2166644290).

Almost surely, 2^21233113111 is an apocalyptic number.

21233113111 is a deficient number, since it is larger than the sum of its proper divisors (4766618369).

21233113111 is a wasteful number, since it uses less digits than its factorization.

21233113111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22806814 (or 22806807 counting only the distinct ones).

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

Adding to 21233113111 its reverse (11131133212), we get a palindrome (32364246323).

The spelling of 21233113111 in words is "twenty-one billion, two hundred thirty-three million, one hundred thirteen thousand, one hundred eleven".