21441515250241 has 2 divisors, whose sum is σ = 21441515250242. Its totient is φ = 21441515250240.

The previous prime is 21441515250161. The next prime is 21441515250319. The reversal of 21441515250241 is 14205251514412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21391966271025 + 49548979216 = 4625145^2 + 222596^2 .

It is a cyclic number.

It is not a de Polignac number, because 21441515250241 - 2¹¹ = 21441515248193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21441515250241.

It is not a weakly prime, because it can be changed into another prime (21441515254241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720757625120 + 10720757625121.

It is an arithmetic number, because the mean of its divisors is an integer number (10720757625121).

Almost surely, 2^{21441515250241} is an apocalyptic number.

It is an amenable number.

21441515250241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21441515250241 is an equidigital number, since it uses as much as digits as its factorization.

21441515250241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64000, while the sum is 37.

Adding to 21441515250241 its reverse (14205251514412), we get a palindrome (35646766764653).

The spelling of 21441515250241 in words is "twenty-one trillion, four hundred forty-one billion, five hundred fifteen million, two hundred fifty thousand, two hundred forty-one".