297977400221 has 2 divisors, whose sum is σ = 297977400222. Its totient is φ = 297977400220.

The previous prime is 297977400191. The next prime is 297977400251. The reversal of 297977400221 is 122004779792.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (297977400191) and next prime (297977400251).

It can be written as a sum of positive squares in only one way, i.e., 263051023225 + 34926376996 = 512885^2 + 186886^2 .

It is a cyclic number.

It is not a de Polignac number, because 297977400221 - 2¹⁸ = 297977138077 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 297977400221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (297977400251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 148988700110 + 148988700111.

It is an arithmetic number, because the mean of its divisors is an integer number (148988700111).

Almost surely, 2^297977400221 is an apocalyptic number.

It is an amenable number.

297977400221 is a deficient number, since it is larger than the sum of its proper divisors (1).

297977400221 is an equidigital number, since it uses as much as digits as its factorization.

297977400221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 889056, while the sum is 50.

The spelling of 297977400221 in words is "two hundred ninety-seven billion, nine hundred seventy-seven million, four hundred thousand, two hundred twenty-one".