21432132120 has 64 divisors (see below), whose sum is σ = 73481598720. Its totient is φ = 4898772864.

The previous prime is 21432132083. The next prime is 21432132121. The reversal of 21432132120 is 2123123412.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432132121) by changing a digit.

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, 12756382 + ... + 12758061.

It is an arithmetic number, because the mean of its divisors is an integer number (1148149980).

Almost surely, 2^21432132120 is an apocalyptic number.

21432132120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21432132120 is an abundant number, since it is smaller than the sum of its proper divisors (52049466600).

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

21432132120 is a wasteful number, since it uses less digits than its factorization.

21432132120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25514464 (or 25514460 counting only the distinct ones).

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

Adding to 21432132120 its reverse (2123123412), we get a palindrome (23555255532).

The spelling of 21432132120 in words is "twenty-one billion, four hundred thirty-two million, one hundred thirty-two thousand, one hundred twenty".