356644416221 has 2 divisors, whose sum is σ = 356644416222. Its totient is φ = 356644416220.

The previous prime is 356644416217. The next prime is 356644416239. The reversal of 356644416221 is 122614446653.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 235599568996 + 121044847225 = 485386^2 + 347915^2 .

It is a cyclic number.

It is not a de Polignac number, because 356644416221 - 2² = 356644416217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (356644416721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 178322208110 + 178322208111.

It is an arithmetic number, because the mean of its divisors is an integer number (178322208111).

Almost surely, 2^356644416221 is an apocalyptic number.

It is an amenable number.

356644416221 is a deficient number, since it is larger than the sum of its proper divisors (1).

356644416221 is an equidigital number, since it uses as much as digits as its factorization.

356644416221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 44.

The spelling of 356644416221 in words is "three hundred fifty-six billion, six hundred forty-four million, four hundred sixteen thousand, two hundred twenty-one".