21324233511 has 24 divisors (see below), whose sum is σ = 35920320800. Its totient is φ = 12185274528.

The previous prime is 21324233459. The next prime is 21324233521. The reversal of 21324233511 is 11533242312.

21324233511 is a `hidden beast` number, since 2 + 1 + 324 + 2 + 335 + 1 + 1 = 666.

It is not a de Polignac number, because 21324233511 - 2¹¹ = 21324231463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21324233521) 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, 3450790 + ... + 3456963.

Almost surely, 2^21324233511 is an apocalyptic number.

21324233511 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21324233511 is a deficient number, since it is larger than the sum of its proper divisors (14596087289).

21324233511 is an equidigital number, since it uses as much as digits as its factorization.

21324233511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6907780 (or 6907763 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

Adding to 21324233511 its reverse (11533242312), we get a palindrome (32857475823).

It can be divided in two parts, 213242 and 33511, that added together give a triangular number (246753 = T₇₀₂).

The spelling of 21324233511 in words is "twenty-one billion, three hundred twenty-four million, two hundred thirty-three thousand, five hundred eleven".