21404421430 has 32 divisors (see below), whose sum is σ = 44368093440. Its totient is φ = 7282635360.

The previous prime is 21404421383. The next prime is 21404421433. The reversal of 21404421430 is 3412440412.

It is a junction number, because it is equal to n+sod(n) for n = 21404421395 and 21404421404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404421433) 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, 1157920 + ... + 1176259.

It is an arithmetic number, because the mean of its divisors is an integer number (1386502920).

Almost surely, 2^21404421430 is an apocalyptic number.

21404421430 is an abundant number, since it is smaller than the sum of its proper divisors (22963672010).

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

21404421430 is a wasteful number, since it uses less digits than its factorization.

21404421430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2334324.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21404421430 its reverse (3412440412), we get a palindrome (24816861842).

The spelling of 21404421430 in words is "twenty-one billion, four hundred four million, four hundred twenty-one thousand, four hundred thirty".