21201330231 has 8 divisors (see below), whose sum is σ = 31409378160. Its totient is φ = 14134220136.

The previous prime is 21201330229. The next prime is 21201330259. The reversal of 21201330231 is 13203310212.

It is not a de Polignac number, because 21201330231 - 2¹ = 21201330229 is a prime.

It is a super-2 number, since 2×21201330231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201331231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392617200 + ... + 392617253.

It is an arithmetic number, because the mean of its divisors is an integer number (3926172270).

Almost surely, 2^21201330231 is an apocalyptic number.

21201330231 is a deficient number, since it is larger than the sum of its proper divisors (10208047929).

21201330231 is an equidigital number, since it uses as much as digits as its factorization.

21201330231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785234462 (or 785234456 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21201330231 its reverse (13203310212), we get a palindrome (34404640443).

The spelling of 21201330231 in words is "twenty-one billion, two hundred one million, three hundred thirty thousand, two hundred thirty-one".