21232400500 has 48 divisors (see below), whose sum is σ = 47063749824. Its totient is φ = 8366186400.

The previous prime is 21232400429. The next prime is 21232400549. The reversal of 21232400500 is 500423212.

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 15 ways as a sum of consecutive naturals, for example, 283402 + ... + 350401.

It is an arithmetic number, because the mean of its divisors is an integer number (980494788).

Almost surely, 2^21232400500 is an apocalyptic number.

21232400500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21232400500 is an abundant number, since it is smaller than the sum of its proper divisors (25831349324).

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

21232400500 is a wasteful number, since it uses less digits than its factorization.

21232400500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633889 (or 633877 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

Adding to 21232400500 its reverse (500423212), we get a palindrome (21732823712).

The spelling of 21232400500 in words is "twenty-one billion, two hundred thirty-two million, four hundred thousand, five hundred".