21523130332 has 24 divisors (see below), whose sum is σ = 42506498160. Its totient is φ = 9445887360.

The previous prime is 21523130329. The next prime is 21523130501. The reversal of 21523130332 is 23303132512.

It is a junction number, because it is equal to n+sod(n) for n = 21523130297 and 21523130306.

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, 8432553 + ... + 8435104.

It is an arithmetic number, because the mean of its divisors is an integer number (1771104090).

Almost surely, 2^21523130332 is an apocalyptic number.

21523130332 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21523130332 is a deficient number, since it is larger than the sum of its proper divisors (20983367828).

21523130332 is a wasteful number, since it uses less digits than its factorization.

21523130332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16867701 (or 16867699 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 25.

Adding to 21523130332 its reverse (23303132512), we get a palindrome (44826262844).

The spelling of 21523130332 in words is "twenty-one billion, five hundred twenty-three million, one hundred thirty thousand, three hundred thirty-two".