21533502525241 has 6 divisors (see below), whose sum is σ = 25049176406970. Its totient is φ = 18457287878736.

The previous prime is 21533502525181. The next prime is 21533502525277. The reversal of 21533502525241 is 14252520533512.

It can be written as a sum of positive squares in only one way, i.e., 13113784719616 + 8419717805625 = 3621296^2 + 2901675^2 .

It is not a de Polignac number, because 21533502525241 - 2¹¹ = 21533502523193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21533502525194 and 21533502525203.

It is not an unprimeable number, because it can be changed into a prime (21533502525841) 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 5 ways as a sum of consecutive naturals, for example, 219729617556 + ... + 219729617653.

It is an arithmetic number, because the mean of its divisors is an integer number (4174862734495).

Almost surely, 2^{21533502525241} is an apocalyptic number.

It is an amenable number.

21533502525241 is a deficient number, since it is larger than the sum of its proper divisors (3515673881729).

21533502525241 is an equidigital number, since it uses as much as digits as its factorization.

21533502525241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439459235223 (or 439459235216 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 40.

The spelling of 21533502525241 in words is "twenty-one trillion, five hundred thirty-three billion, five hundred two million, five hundred twenty-five thousand, two hundred forty-one".