21121232232 has 64 divisors (see below), whose sum is σ = 54607104000. Its totient is φ = 6800713920.

The previous prime is 21121232213. The next prime is 21121232267. The reversal of 21121232232 is 23223212112.

It is a super-2 number, since 2×21121232232² (a number of 21 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21121232199 and 21121232208.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 381019 + ... + 432917.

It is an arithmetic number, because the mean of its divisors is an integer number (853236000).

Almost surely, 2^21121232232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21121232232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27303552000).

21121232232 is an abundant number, since it is smaller than the sum of its proper divisors (33485871768).

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

21121232232 is a wasteful number, since it uses less digits than its factorization.

21121232232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52486 (or 52482 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

Adding to 21121232232 its reverse (23223212112), we get a palindrome (44344444344).

The spelling of 21121232232 in words is "twenty-one billion, one hundred twenty-one million, two hundred thirty-two thousand, two hundred thirty-two".