21000202241 has 2 divisors, whose sum is σ = 21000202242. Its totient is φ = 21000202240.

The previous prime is 21000202213. The next prime is 21000202247. The reversal of 21000202241 is 14220200012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14609798641 + 6390403600 = 120871^2 + 79940^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000202241 - 2¹⁰ = 21000201217 is a prime.

It is not a weakly prime, because it can be changed into another prime (21000202247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500101120 + 10500101121.

It is an arithmetic number, because the mean of its divisors is an integer number (10500101121).

Almost surely, 2^21000202241 is an apocalyptic number.

It is an amenable number.

21000202241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000202241 is an equidigital number, since it uses as much as digits as its factorization.

21000202241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21000202241 its reverse (14220200012), we get a palindrome (35220402253).

The spelling of 21000202241 in words is "twenty-one billion, two hundred two thousand, two hundred forty-one".