21113233011 has 128 divisors (see below), whose sum is σ = 36754663680. Its totient is φ = 11860992000.

The previous prime is 21113233007. The next prime is 21113233061. The reversal of 21113233011 is 11033231112.

It is not a de Polignac number, because 21113233011 - 2² = 21113233007 is a prime.

It is a super-2 number, since 2×21113233011² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21113233061) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 31941021 + ... + 31941681.

It is an arithmetic number, because the mean of its divisors is an integer number (287145810).

Almost surely, 2^21113233011 is an apocalyptic number.

21113233011 is a deficient number, since it is larger than the sum of its proper divisors (15641430669).

21113233011 is a wasteful number, since it uses less digits than its factorization.

21113233011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854 (or 848 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21113233011 its reverse (11033231112), we get a palindrome (32146464123).

The spelling of 21113233011 in words is "twenty-one billion, one hundred thirteen million, two hundred thirty-three thousand, eleven".