21404468215 has 16 divisors (see below), whose sum is σ = 27683990208. Its totient is φ = 15793330176.

The previous prime is 21404468203. The next prime is 21404468243. The reversal of 21404468215 is 51286440412.

It is not a de Polignac number, because 21404468215 - 2⁹ = 21404467703 is a prime.

It is a Duffinian number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 56187 + ... + 214396.

It is an arithmetic number, because the mean of its divisors is an integer number (1730249388).

Almost surely, 2^21404468215 is an apocalyptic number.

21404468215 is a deficient number, since it is larger than the sum of its proper divisors (6279521993).

21404468215 is a wasteful number, since it uses less digits than its factorization.

21404468215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271818.

The product of its (nonzero) digits is 61440, while the sum is 37.

The spelling of 21404468215 in words is "twenty-one billion, four hundred four million, four hundred sixty-eight thousand, two hundred fifteen".