210020816250457 has 2 divisors, whose sum is σ = 210020816250458. Its totient is φ = 210020816250456.

The previous prime is 210020816250439. The next prime is 210020816250467. The reversal of 210020816250457 is 754052618020012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131998591596096 + 78022224654361 = 11489064^2 + 8833019^2 .

It is a cyclic number.

It is not a de Polignac number, because 210020816250457 - 2¹⁵ = 210020816217689 is a prime.

It is not a weakly prime, because it can be changed into another prime (210020816250467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010408125228 + 105010408125229.

It is an arithmetic number, because the mean of its divisors is an integer number (105010408125229).

Almost surely, 2^{210020816250457} is an apocalyptic number.

It is an amenable number.

210020816250457 is a deficient number, since it is larger than the sum of its proper divisors (1).

210020816250457 is an equidigital number, since it uses as much as digits as its factorization.

210020816250457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 268800, while the sum is 43.

The spelling of 210020816250457 in words is "two hundred ten trillion, twenty billion, eight hundred sixteen million, two hundred fifty thousand, four hundred fifty-seven".