21404582527 has 16 divisors (see below), whose sum is σ = 22257607680. Its totient is φ = 20568506112.

The previous prime is 21404582501. The next prime is 21404582533. The reversal of 21404582527 is 72528540412.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21404582527 - 2²³ = 21396193919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21404582527.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404582627) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2481999 + ... + 2490607.

It is an arithmetic number, because the mean of its divisors is an integer number (1391100480).

Almost surely, 2^21404582527 is an apocalyptic number.

21404582527 is a deficient number, since it is larger than the sum of its proper divisors (853025153).

21404582527 is an equidigital number, since it uses as much as digits as its factorization.

21404582527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9582.

The product of its (nonzero) digits is 179200, while the sum is 40.

The spelling of 21404582527 in words is "twenty-one billion, four hundred four million, five hundred eighty-two thousand, five hundred twenty-seven".