21131122232 has 64 divisors (see below), whose sum is σ = 45948470400. Its totient is φ = 9009360000.

The previous prime is 21131122231. The next prime is 21131122253. The reversal of 21131122232 is 23222113112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131122231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106307 + ... + 231437.

It is an arithmetic number, because the mean of its divisors is an integer number (717944850).

Almost surely, 2^21131122232 is an apocalyptic number.

21131122232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21131122232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22974235200).

21131122232 is an abundant number, since it is smaller than the sum of its proper divisors (24817348168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21131122232 is a wasteful number, since it uses less digits than its factorization.

21131122232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125268 (or 125264 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

Adding to 21131122232 its reverse (23222113112), we get a palindrome (44353235344).

The spelling of 21131122232 in words is "twenty-one billion, one hundred thirty-one million, one hundred twenty-two thousand, two hundred thirty-two".