21232013311 has 4 divisors (see below), whose sum is σ = 21531055824. Its totient is φ = 20932970800.

The previous prime is 21232013291. The next prime is 21232013443. The reversal of 21232013311 is 11331023212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21232013311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232013611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149521150 + ... + 149521291.

It is an arithmetic number, because the mean of its divisors is an integer number (5382763956).

Almost surely, 2^21232013311 is an apocalyptic number.

21232013311 is a deficient number, since it is larger than the sum of its proper divisors (299042513).

21232013311 is an equidigital number, since it uses as much as digits as its factorization.

21232013311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299042512.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21232013311 its reverse (11331023212), we get a palindrome (32563036523).

Subtracting from 21232013311 its reverse (11331023212), we obtain a palindrome (9900990099).

The spelling of 21232013311 in words is "twenty-one billion, two hundred thirty-two million, thirteen thousand, three hundred eleven".