21432403220 has 24 divisors (see below), whose sum is σ = 45012429000. Its totient is φ = 8572126592.

The previous prime is 21432403219. The next prime is 21432403229. The reversal of 21432403220 is 2230423412.

It can be written as a sum of positive squares in 4 ways, for example, as 2677648516 + 18754754704 = 51746^2 + 136948^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432403229) 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 7 ways as a sum of consecutive naturals, for example, 184586 + ... + 277374.

It is an arithmetic number, because the mean of its divisors is an integer number (1875517875).

Almost surely, 2^21432403220 is an apocalyptic number.

21432403220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21432403220 is an abundant number, since it is smaller than the sum of its proper divisors (23580025780).

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

21432403220 is a wasteful number, since it uses less digits than its factorization.

21432403220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104347 (or 104345 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21432403220 its reverse (2230423412), we get a palindrome (23662826632).

The spelling of 21432403220 in words is "twenty-one billion, four hundred thirty-two million, four hundred three thousand, two hundred twenty".