21432412120 has 32 divisors (see below), whose sum is σ = 55111917600. Its totient is φ = 7348255488.

The previous prime is 21432412109. The next prime is 21432412181. The reversal of 21432412120 is 2121423412.

It is a junction number, because it is equal to n+sod(n) for n = 21432412091 and 21432412100.

It is a congruent number.

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, 38271885 + ... + 38272444.

It is an arithmetic number, because the mean of its divisors is an integer number (1722247425).

Almost surely, 2^21432412120 is an apocalyptic number.

21432412120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21432412120 is an abundant number, since it is smaller than the sum of its proper divisors (33679505480).

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

21432412120 is a wasteful number, since it uses less digits than its factorization.

21432412120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76544347 (or 76544343 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21432412120 its reverse (2121423412), we get a palindrome (23553835532).

The spelling of 21432412120 in words is "twenty-one billion, four hundred thirty-two million, four hundred twelve thousand, one hundred twenty".