210220749857 has 2 divisors, whose sum is σ = 210220749858. Its totient is φ = 210220749856.

The previous prime is 210220749853. The next prime is 210220749881. The reversal of 210220749857 is 758947022012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165714940561 + 44505809296 = 407081^2 + 210964^2 .

It is a cyclic number.

It is not a de Polignac number, because 210220749857 - 2² = 210220749853 is a prime.

It is not a weakly prime, because it can be changed into another prime (210220749853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105110374928 + 105110374929.

It is an arithmetic number, because the mean of its divisors is an integer number (105110374929).

Almost surely, 2^210220749857 is an apocalyptic number.

It is an amenable number.

210220749857 is a deficient number, since it is larger than the sum of its proper divisors (1).

210220749857 is an equidigital number, since it uses as much as digits as its factorization.

210220749857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 564480, while the sum is 47.

The spelling of 210220749857 in words is "two hundred ten billion, two hundred twenty million, seven hundred forty-nine thousand, eight hundred fifty-seven".