21232230331 has 18 divisors (see below), whose sum is σ = 23629546332. Its totient is φ = 19069071840.

The previous prime is 21232230329. The next prime is 21232230391. The reversal of 21232230331 is 13303223212.

It is not a de Polignac number, because 21232230331 - 2¹ = 21232230329 is a prime.

It is a super-2 number, since 2×21232230331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21232230391) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 185476 + ... + 277246.

It is an arithmetic number, because the mean of its divisors is an integer number (1312752574).

Almost surely, 2^21232230331 is an apocalyptic number.

21232230331 is a deficient number, since it is larger than the sum of its proper divisors (2397316001).

21232230331 is an equidigital number, since it uses as much as digits as its factorization.

21232230331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91871 (or 91821 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21232230331 its reverse (13303223212), we get a palindrome (34535453543).

The spelling of 21232230331 in words is "twenty-one billion, two hundred thirty-two million, two hundred thirty thousand, three hundred thirty-one".