21141241217 has 2 divisors, whose sum is σ = 21141241218. Its totient is φ = 21141241216.

The previous prime is 21141241133. The next prime is 21141241267. The reversal of 21141241217 is 71214214112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19813659121 + 1327582096 = 140761^2 + 36436^2 .

It is a cyclic number.

It is not a de Polignac number, because 21141241217 - 2¹⁰ = 21141240193 is a prime.

It is not a weakly prime, because it can be changed into another prime (21141241267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570620608 + 10570620609.

It is an arithmetic number, because the mean of its divisors is an integer number (10570620609).

Almost surely, 2^21141241217 is an apocalyptic number.

It is an amenable number.

21141241217 is a deficient number, since it is larger than the sum of its proper divisors (1).

21141241217 is an equidigital number, since it uses as much as digits as its factorization.

21141241217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 896, while the sum is 26.

Adding to 21141241217 its reverse (71214214112), we get a palindrome (92355455329).

The spelling of 21141241217 in words is "twenty-one billion, one hundred forty-one million, two hundred forty-one thousand, two hundred seventeen".