215220520722241 has 2 divisors, whose sum is σ = 215220520722242. Its totient is φ = 215220520722240.

The previous prime is 215220520722191. The next prime is 215220520722301. The reversal of 215220520722241 is 142227025022512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126452184049216 + 88768336673025 = 11245096^2 + 9421695^2 .

It is a cyclic number.

It is not a de Polignac number, because 215220520722241 - 2⁷ = 215220520722113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 215220520722241.

It is not a weakly prime, because it can be changed into another prime (215220520722341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107610260361120 + 107610260361121.

It is an arithmetic number, because the mean of its divisors is an integer number (107610260361121).

Almost surely, 2^{215220520722241} is an apocalyptic number.

It is an amenable number.

215220520722241 is a deficient number, since it is larger than the sum of its proper divisors (1).

215220520722241 is an equidigital number, since it uses as much as digits as its factorization.

215220520722241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 89600, while the sum is 37.

Adding to 215220520722241 its reverse (142227025022512), we get a palindrome (357447545744753).

The spelling of 215220520722241 in words is "two hundred fifteen trillion, two hundred twenty billion, five hundred twenty million, seven hundred twenty-two thousand, two hundred forty-one".