21231122331 has 8 divisors (see below), whose sum is σ = 28392164944. Its totient is φ = 14112080640.

The previous prime is 21231122267. The next prime is 21231122359. The reversal of 21231122331 is 13322113212.

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

It is not a de Polignac number, because 21231122331 - 2⁶ = 21231122267 is a prime.

It is a super-2 number, since 2×21231122331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21231122298 and 21231122307.

It is not an unprimeable number, because it can be changed into a prime (21231122431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10499050 + ... + 10501071.

It is an arithmetic number, because the mean of its divisors is an integer number (3549020618).

Almost surely, 2^21231122331 is an apocalyptic number.

21231122331 is a deficient number, since it is larger than the sum of its proper divisors (7161042613).

21231122331 is a wasteful number, since it uses less digits than its factorization.

21231122331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21000461.

The product of its digits is 432, while the sum is 21.

Adding to 21231122331 its reverse (13322113212), we get a palindrome (34553235543).

The spelling of 21231122331 in words is "twenty-one billion, two hundred thirty-one million, one hundred twenty-two thousand, three hundred thirty-one".