21404404210 has 64 divisors (see below), whose sum is σ = 48364646400. Its totient is φ = 6650119872.

The previous prime is 21404404193. The next prime is 21404404213. The reversal of 21404404210 is 1240440412.

It is not an unprimeable number, because it can be changed into a prime (21404404213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 319270 + ... + 380449.

It is an arithmetic number, because the mean of its divisors is an integer number (755697600).

Almost surely, 2^21404404210 is an apocalyptic number.

21404404210 is an abundant number, since it is smaller than the sum of its proper divisors (26960242190).

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

21404404210 is a wasteful number, since it uses less digits than its factorization.

21404404210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699775.

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

Adding to 21404404210 its reverse (1240440412), we get a palindrome (22644844622).

The spelling of 21404404210 in words is "twenty-one billion, four hundred four million, four hundred four thousand, two hundred ten".