21404124410 has 16 divisors (see below), whose sum is σ = 38566085256. Its totient is φ = 8553058368.

The previous prime is 21404124403. The next prime is 21404124421. The reversal of 21404124410 is 1442140412.

It can be written as a sum of positive squares in 4 ways, for example, as 21315708001 + 88416409 = 145999^2 + 9403^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1063457 + ... + 1083396.

Almost surely, 2^21404124410 is an apocalyptic number.

21404124410 is a deficient number, since it is larger than the sum of its proper divisors (17161960846).

21404124410 is a wasteful number, since it uses less digits than its factorization.

21404124410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2147857.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21404124410 its reverse (1442140412), we get a palindrome (22846264822).

The spelling of 21404124410 in words is "twenty-one billion, four hundred four million, one hundred twenty-four thousand, four hundred ten".