21432113020 has 24 divisors (see below), whose sum is σ = 46559419200. Its totient is φ = 8277229632.

The previous prime is 21432113009. The next prime is 21432113033. The reversal of 21432113020 is 2031123412.

It is a happy number.

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, 18475380 + ... + 18476539.

It is an arithmetic number, because the mean of its divisors is an integer number (1939975800).

Almost surely, 2^21432113020 is an apocalyptic number.

21432113020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21432113020 is an abundant number, since it is smaller than the sum of its proper divisors (25127306180).

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

21432113020 is a wasteful number, since it uses less digits than its factorization.

21432113020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36951957 (or 36951955 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21432113020 its reverse (2031123412), we get a palindrome (23463236432).

The spelling of 21432113020 in words is "twenty-one billion, four hundred thirty-two million, one hundred thirteen thousand, twenty".