21404401420 has 12 divisors (see below), whose sum is σ = 44949243024. Its totient is φ = 8561760560.

The previous prime is 21404401363. The next prime is 21404401433. The reversal of 21404401420 is 2410440412.

It is a junction number, because it is equal to n+sod(n) for n = 21404401391 and 21404401400.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535110016 + ... + 535110055.

It is an arithmetic number, because the mean of its divisors is an integer number (3745770252).

Almost surely, 2^21404401420 is an apocalyptic number.

21404401420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21404401420 is an abundant number, since it is smaller than the sum of its proper divisors (23544841604).

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

21404401420 is a wasteful number, since it uses less digits than its factorization.

21404401420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070220080 (or 1070220078 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21404401420 its reverse (2410440412), we get a palindrome (23814841832).

The spelling of 21404401420 in words is "twenty-one billion, four hundred four million, four hundred one thousand, four hundred twenty".