21531053241 has 24 divisors (see below), whose sum is σ = 31549699584. Its totient is φ = 14146816320.

The previous prime is 21531053207. The next prime is 21531053263. The reversal of 21531053241 is 14235013512.

21531053241 is a `hidden beast` number, since 21 + 5 + 310 + 5 + 324 + 1 = 666.

It is not a de Polignac number, because 21531053241 - 2⁶ = 21531053177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21531053941) 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 23 ways as a sum of consecutive naturals, for example, 2837845 + ... + 2845421.

It is an arithmetic number, because the mean of its divisors is an integer number (1314570816).

Almost surely, 2^21531053241 is an apocalyptic number.

It is an amenable number.

21531053241 is a deficient number, since it is larger than the sum of its proper divisors (10018646343).

21531053241 is a wasteful number, since it uses less digits than its factorization.

21531053241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12101 (or 12098 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 21531053241 its reverse (14235013512), we get a palindrome (35766066753).

The spelling of 21531053241 in words is "twenty-one billion, five hundred thirty-one million, fifty-three thousand, two hundred forty-one".