21035224241 has 6 divisors (see below), whose sum is σ = 21989563890. Its totient is φ = 20120648768.

The previous prime is 21035224237. The next prime is 21035224277. The reversal of 21035224241 is 14242253012.

It can be written as a sum of positive squares in only one way, i.e., 15540115600 + 5495108641 = 124660^2 + 74129^2 .

It is not a de Polignac number, because 21035224241 - 2² = 21035224237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21035224241.

It is not an unprimeable number, because it can be changed into a prime (21035254241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19881536 + ... + 19882593.

It is an arithmetic number, because the mean of its divisors is an integer number (3664927315).

Almost surely, 2^21035224241 is an apocalyptic number.

It is an amenable number.

21035224241 is a deficient number, since it is larger than the sum of its proper divisors (954339649).

21035224241 is an equidigital number, since it uses as much as digits as its factorization.

21035224241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39764175 (or 39764152 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 21035224241 its reverse (14242253012), we get a palindrome (35277477253).

The spelling of 21035224241 in words is "twenty-one billion, thirty-five million, two hundred twenty-four thousand, two hundred forty-one".