21020244140041 has 4 divisors (see below), whose sum is σ = 21745080144900. Its totient is φ = 20295408135184.

The previous prime is 21020244140029. The next prime is 21020244140047. The reversal of 21020244140041 is 14004144202012.

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 3933760523641 + 17086483616400 = 1983371^2 + 4133580^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020244140041 - 2⁹ = 21020244139529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21020244139988 and 21020244140015.

It is not an unprimeable number, because it can be changed into a prime (21020244140047) 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, 362418002386 + ... + 362418002443.

It is an arithmetic number, because the mean of its divisors is an integer number (5436270036225).

Almost surely, 2^{21020244140041} is an apocalyptic number.

It is an amenable number.

21020244140041 is a deficient number, since it is larger than the sum of its proper divisors (724836004859).

21020244140041 is an equidigital number, since it uses as much as digits as its factorization.

21020244140041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724836004858.

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 21020244140041 its reverse (14004144202012), we get a palindrome (35024388342053).

The spelling of 21020244140041 in words is "twenty-one trillion, twenty billion, two hundred forty-four million, one hundred forty thousand, forty-one".