21503520235049 has 4 divisors (see below), whose sum is σ = 21524019302100. Its totient is φ = 21483021168000.

The previous prime is 21503520234997. The next prime is 21503520235073. The reversal of 21503520235049 is 94053202530512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14184563737600 + 7318956497449 = 3766240^2 + 2705357^2 .

It is a cyclic number.

It is not a de Polignac number, because 21503520235049 - 2¹² = 21503520230953 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21503520234997 and 21503520235015.

It is not an unprimeable number, because it can be changed into a prime (21503520231049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10249531952 + ... + 10249534049.

It is an arithmetic number, because the mean of its divisors is an integer number (5381004825525).

Almost surely, 2^{21503520235049} is an apocalyptic number.

It is an amenable number.

21503520235049 is a deficient number, since it is larger than the sum of its proper divisors (20499067051).

21503520235049 is a wasteful number, since it uses less digits than its factorization.

21503520235049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20499067050.

The product of its (nonzero) digits is 324000, while the sum is 41.

The spelling of 21503520235049 in words is "twenty-one trillion, five hundred three billion, five hundred twenty million, two hundred thirty-five thousand, forty-nine".