207380821 has 2 divisors, whose sum is σ = 207380822. Its totient is φ = 207380820.

The previous prime is 207380813. The next prime is 207380843. The reversal of 207380821 is 128083702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155900196 + 51480625 = 12486^2 + 7175^2 .

It is a cyclic number.

It is not a de Polignac number, because 207380821 - 2³ = 207380813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (207380851) 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, 103690410 + 103690411.

It is an arithmetic number, because the mean of its divisors is an integer number (103690411).

Almost surely, 2^207380821 is an apocalyptic number.

It is an amenable number.

207380821 is a deficient number, since it is larger than the sum of its proper divisors (1).

207380821 is an equidigital number, since it uses as much as digits as its factorization.

207380821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 207380821 is about 14400.7229332419. The cubic root of 207380821 is about 591.9107077479.

The spelling of 207380821 in words is "two hundred seven million, three hundred eighty thousand, eight hundred twenty-one".