21202032231 has 16 divisors (see below), whose sum is σ = 32140894720. Its totient is φ = 13805973720.

The previous prime is 21202032191. The next prime is 21202032233. The reversal of 21202032231 is 13223020212.

It is not a de Polignac number, because 21202032231 - 2¹¹ = 21202030183 is a prime.

It is a super-2 number, since 2×21202032231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202032233) 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 15 ways as a sum of consecutive naturals, for example, 9129775 + ... + 9132096.

It is an arithmetic number, because the mean of its divisors is an integer number (2008805920).

Almost surely, 2^21202032231 is an apocalyptic number.

21202032231 is a deficient number, since it is larger than the sum of its proper divisors (10938862489).

21202032231 is a wasteful number, since it uses less digits than its factorization.

21202032231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18261923 (or 18261917 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21202032231 its reverse (13223020212), we get a palindrome (34425052443).

The spelling of 21202032231 in words is "twenty-one billion, two hundred two million, thirty-two thousand, two hundred thirty-one".