21531424435241 has 12 divisors (see below), whose sum is σ = 25050062483712. Its totient is φ = 18453072540168.

The previous prime is 21531424435151. The next prime is 21531424435273. The reversal of 21531424435241 is 14253442413512.

It is not a de Polignac number, because 21531424435241 - 2³⁴ = 21514244566057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21531424435141) 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 11 ways as a sum of consecutive naturals, for example, 28602245 + ... + 29345378.

It is an arithmetic number, because the mean of its divisors is an integer number (2087505206976).

Almost surely, 2^{21531424435241} is an apocalyptic number.

It is an amenable number.

21531424435241 is a deficient number, since it is larger than the sum of its proper divisors (3518638048471).

21531424435241 is an equidigital number, since it uses as much as digits as its factorization.

21531424435241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57955220 (or 57955213 counting only the distinct ones).

The product of its digits is 460800, while the sum is 41.

Adding to 21531424435241 its reverse (14253442413512), we get a palindrome (35784866848753).

The spelling of 21531424435241 in words is "twenty-one trillion, five hundred thirty-one billion, four hundred twenty-four million, four hundred thirty-five thousand, two hundred forty-one".