21002121310241 has 2 divisors, whose sum is σ = 21002121310242. Its totient is φ = 21002121310240.

The previous prime is 21002121310207. The next prime is 21002121310271. The reversal of 21002121310241 is 14201312120012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15497016390625 + 5505104919616 = 3936625^2 + 2346296^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002121310241 - 2²⁶ = 21002054201377 is a prime.

It is not a weakly prime, because it can be changed into another prime (21002121310271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501060655120 + 10501060655121.

It is an arithmetic number, because the mean of its divisors is an integer number (10501060655121).

Almost surely, 2^{21002121310241} is an apocalyptic number.

It is an amenable number.

21002121310241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002121310241 is an equidigital number, since it uses as much as digits as its factorization.

21002121310241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21002121310241 its reverse (14201312120012), we get a palindrome (35203433430253).

The spelling of 21002121310241 in words is "twenty-one trillion, two billion, one hundred twenty-one million, three hundred ten thousand, two hundred forty-one".