21130021232 has 40 divisors (see below), whose sum is σ = 41288607360. Its totient is φ = 10475042240.

The previous prime is 21130021219. The next prime is 21130021337. The reversal of 21130021232 is 23212003112.

It is a self number, because there is not a number n which added to its sum of digits gives 21130021232.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2760803 + ... + 2768445.

It is an arithmetic number, because the mean of its divisors is an integer number (1032215184).

Almost surely, 2^21130021232 is an apocalyptic number.

It is an amenable number.

21130021232 is a deficient number, since it is larger than the sum of its proper divisors (20158586128).

21130021232 is a wasteful number, since it uses less digits than its factorization.

21130021232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9101 (or 9095 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21130021232 its reverse (23212003112), we get a palindrome (44342024344).

The spelling of 21130021232 in words is "twenty-one billion, one hundred thirty million, twenty-one thousand, two hundred thirty-two".