21432313420 has 48 divisors (see below), whose sum is σ = 51553813248. Its totient is φ = 7331613120.

The previous prime is 21432313387. The next prime is 21432313421. The reversal of 21432313420 is 2431323412.

It is a super-2 number, since 2×21432313420² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21432313421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110766 + ... + 234805.

It is an arithmetic number, because the mean of its divisors is an integer number (1074037776).

Almost surely, 2^21432313420 is an apocalyptic number.

21432313420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21432313420 is an abundant number, since it is smaller than the sum of its proper divisors (30121499828).

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

21432313420 is a wasteful number, since it uses less digits than its factorization.

21432313420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346030 (or 346028 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21432313420 its reverse (2431323412), we get a palindrome (23863636832).

The spelling of 21432313420 in words is "twenty-one billion, four hundred thirty-two million, three hundred thirteen thousand, four hundred twenty".