21403440321004 has 12 divisors (see below), whose sum is σ = 42806880642064. Its totient is φ = 9172902994704.

The previous prime is 21403440320987. The next prime is 21403440321071. The reversal of 21403440321004 is 40012304430412.

21403440321004 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 764408582893 = 21403440321004 / (2 + 1 + 4 + 0 + 3 + 4 + 4 + 0 + 3 + 2 + 1 + 0 + 0 + 4).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 382204291419 + ... + 382204291474.

Almost surely, 2^{21403440321004} is an apocalyptic number.

It is an amenable number.

21403440321004 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21403440321004 is a wasteful number, since it uses less digits than its factorization.

21403440321004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764408582904 (or 764408582902 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21403440321004 its reverse (40012304430412), we get a palindrome (61415744751416).

The spelling of 21403440321004 in words is "twenty-one trillion, four hundred three billion, four hundred forty million, three hundred twenty-one thousand, four".