21404606476375 has 16 divisors (see below), whose sum is σ = 26760907585152. Its totient is φ = 17092942423200.

The previous prime is 21404606476373. The next prime is 21404606476399. The reversal of 21404606476375 is 57367460640412.

It is a happy number.

It is not a de Polignac number, because 21404606476375 - 2¹ = 21404606476373 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 (21404606476373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153643887 + ... + 153783136.

It is an arithmetic number, because the mean of its divisors is an integer number (1672556724072).

Almost surely, 2^{21404606476375} is an apocalyptic number.

21404606476375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21404606476375 is a deficient number, since it is larger than the sum of its proper divisors (5356301108777).

21404606476375 is an equidigital number, since it uses as much as digits as its factorization.

21404606476375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307427595 (or 307427585 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 55.

The spelling of 21404606476375 in words is "twenty-one trillion, four hundred four billion, six hundred six million, four hundred seventy-six thousand, three hundred seventy-five".