21001001202241 has 2 divisors, whose sum is σ = 21001001202242. Its totient is φ = 21001001202240.

The previous prime is 21001001202151. The next prime is 21001001202289. The reversal of 21001001202241 is 14220210010012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17021359233025 + 3979641969216 = 4125695^2 + 1994904^2 .

It is a cyclic number.

It is not a de Polignac number, because 21001001202241 - 2²¹ = 21000999105089 is a prime.

It is not a weakly prime, because it can be changed into another prime (21001001202941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500500601120 + 10500500601121.

It is an arithmetic number, because the mean of its divisors is an integer number (10500500601121).

Almost surely, 2^{21001001202241} is an apocalyptic number.

It is an amenable number.

21001001202241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001001202241 is an equidigital number, since it uses as much as digits as its factorization.

21001001202241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21001001202241 its reverse (14220210010012), we get a palindrome (35221211212253).

The spelling of 21001001202241 in words is "twenty-one trillion, one billion, one million, two hundred two thousand, two hundred forty-one".