21541530404 has 12 divisors (see below), whose sum is σ = 37732175964. Its totient is φ = 10760908704.

The previous prime is 21541530403. The next prime is 21541530407. The reversal of 21541530404 is 40403514512.

It can be written as a sum of positive squares in 2 ways, for example, as 17881038400 + 3660492004 = 133720^2 + 60502^2 .

It is not an unprimeable number, because it can be changed into a prime (21541530403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2459207 + ... + 2467950.

It is an arithmetic number, because the mean of its divisors is an integer number (3144347997).

Almost surely, 2^21541530404 is an apocalyptic number.

It is an amenable number.

21541530404 is a deficient number, since it is larger than the sum of its proper divisors (16190645560).

21541530404 is a wasteful number, since it uses less digits than its factorization.

21541530404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4928254 (or 4928252 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The spelling of 21541530404 in words is "twenty-one billion, five hundred forty-one million, five hundred thirty thousand, four hundred four".