21313233231 has 8 divisors (see below), whose sum is σ = 28424543280. Its totient is φ = 14205372672.

The previous prime is 21313233229. The next prime is 21313233239. The reversal of 21313233231 is 13233231312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21313233231 - 2¹ = 21313233229 is a prime.

It is a super-2 number, since 2×21313233231² (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 (21313233239) 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, 847920 + ... + 872693.

It is an arithmetic number, because the mean of its divisors is an integer number (3553067910).

Almost surely, 2^21313233231 is an apocalyptic number.

21313233231 is a deficient number, since it is larger than the sum of its proper divisors (7111310049).

21313233231 is a wasteful number, since it uses less digits than its factorization.

21313233231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724745.

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

Adding to 21313233231 its reverse (13233231312), we get a palindrome (34546464543).

The spelling of 21313233231 in words is "twenty-one billion, three hundred thirteen million, two hundred thirty-three thousand, two hundred thirty-one".