21233313231 has 32 divisors (see below), whose sum is σ = 30706226880. Its totient is φ = 12973768704.

The previous prime is 21233313221. The next prime is 21233313307. The reversal of 21233313231 is 13231333212.

It is not a de Polignac number, because 21233313231 - 2⁷ = 21233313103 is a prime.

It is a super-2 number, since 2×21233313231² (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 (21233313221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4340635 + ... + 4345523.

It is an arithmetic number, because the mean of its divisors is an integer number (959569590).

Almost surely, 2^21233313231 is an apocalyptic number.

21233313231 is a deficient number, since it is larger than the sum of its proper divisors (9472913649).

21233313231 is a wasteful number, since it uses less digits than its factorization.

21233313231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5675.

The product of its digits is 1944, while the sum is 24.

Adding to 21233313231 its reverse (13231333212), we get a palindrome (34464646443).

The spelling of 21233313231 in words is "twenty-one billion, two hundred thirty-three million, three hundred thirteen thousand, two hundred thirty-one".