21131123232 has 48 divisors (see below), whose sum is σ = 55477729440. Its totient is φ = 7042624512.

The previous prime is 21131123173. The next prime is 21131123297. The reversal of 21131123232 is 23232113112.

It is a tau number, because it is divible by the number of its divisors (48).

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 = 21131123199 and 21131123208.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 830248 + ... + 855320.

It is an arithmetic number, because the mean of its divisors is an integer number (1155786030).

Almost surely, 2^21131123232 is an apocalyptic number.

It is an amenable number.

21131123232 is an abundant number, since it is smaller than the sum of its proper divisors (34346606208).

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

21131123232 is a wasteful number, since it uses less digits than its factorization.

21131123232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33865 (or 33857 counting only the distinct ones).

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

Adding to 21131123232 its reverse (23232113112), we get a palindrome (44363236344).

The spelling of 21131123232 in words is "twenty-one billion, one hundred thirty-one million, one hundred twenty-three thousand, two hundred thirty-two".