21404253411 has 24 divisors (see below), whose sum is σ = 31057135200. Its totient is φ = 14205081600.

The previous prime is 21404253389. The next prime is 21404253419. The reversal of 21404253411 is 11435240412.

21404253411 is a `hidden beast` number, since 2 + 1 + 404 + 253 + 4 + 1 + 1 = 666.

It is not a de Polignac number, because 21404253411 - 2²³ = 21395864803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21404253419) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2008066 + ... + 2018696.

It is an arithmetic number, because the mean of its divisors is an integer number (1294047300).

Almost surely, 2^21404253411 is an apocalyptic number.

21404253411 is a deficient number, since it is larger than the sum of its proper divisors (9652881789).

21404253411 is a wasteful number, since it uses less digits than its factorization.

21404253411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11627 (or 11624 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 21404253411 its reverse (11435240412), we get a palindrome (32839493823).

The spelling of 21404253411 in words is "twenty-one billion, four hundred four million, two hundred fifty-three thousand, four hundred eleven".