21404040413 has 8 divisors (see below), whose sum is σ = 24499573632. Its totient is φ = 18317960496.

The previous prime is 21404040389. The next prime is 21404040433. The reversal of 21404040413 is 31404040412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21404040413 - 2⁸ = 21404040157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404040433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2358470 + ... + 2367527.

It is an arithmetic number, because the mean of its divisors is an integer number (3062446704).

Almost surely, 2^21404040413 is an apocalyptic number.

It is an amenable number.

21404040413 is a deficient number, since it is larger than the sum of its proper divisors (3095533219).

21404040413 is an equidigital number, since it uses as much as digits as its factorization.

21404040413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4726651.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21404040413 its reverse (31404040412), we get a palindrome (52808080825).

Subtracting 21404040413 from its reverse (31404040412), we obtain a palindrome (9999999999).

The spelling of 21404040413 in words is "twenty-one billion, four hundred four million, forty thousand, four hundred thirteen".