610865204221 has 2 divisors, whose sum is σ = 610865204222. Its totient is φ = 610865204220.

The previous prime is 610865204129. The next prime is 610865204227. The reversal of 610865204221 is 122402568016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 488760384996 + 122104819225 = 699114^2 + 349435^2 .

It is a cyclic number.

It is not a de Polignac number, because 610865204221 - 2³⁵ = 576505465853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (610865204227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305432602110 + 305432602111.

It is an arithmetic number, because the mean of its divisors is an integer number (305432602111).

Almost surely, 2^610865204221 is an apocalyptic number.

It is an amenable number.

610865204221 is a deficient number, since it is larger than the sum of its proper divisors (1).

610865204221 is an equidigital number, since it uses as much as digits as its factorization.

610865204221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 610865204221 in words is "six hundred ten billion, eight hundred sixty-five million, two hundred four thousand, two hundred twenty-one".