21324401420 has 24 divisors (see below), whose sum is σ = 51178563744. Its totient is φ = 7311223296.

The previous prime is 21324401393. The next prime is 21324401429. The reversal of 21324401420 is 2410442312.

It is not an unprimeable number, because it can be changed into a prime (21324401429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76158437 + ... + 76158716.

It is an arithmetic number, because the mean of its divisors is an integer number (2132440156).

Almost surely, 2^21324401420 is an apocalyptic number.

21324401420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21324401420 is an abundant number, since it is smaller than the sum of its proper divisors (29854162324).

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

21324401420 is a wasteful number, since it uses less digits than its factorization.

21324401420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152317169 (or 152317167 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21324401420 its reverse (2410442312), we get a palindrome (23734843732).

The spelling of 21324401420 in words is "twenty-one billion, three hundred twenty-four million, four hundred one thousand, four hundred twenty".