203315523221 has 2 divisors, whose sum is σ = 203315523222. Its totient is φ = 203315523220.

The previous prime is 203315523199. The next prime is 203315523223. The reversal of 203315523221 is 122325513302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144016455025 + 59299068196 = 379495^2 + 243514^2 .

It is a cyclic number.

It is not a de Polignac number, because 203315523221 - 2⁶ = 203315523157 is a prime.

It is a Sophie Germain prime.

Together with 203315523223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203315523223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101657761610 + 101657761611.

It is an arithmetic number, because the mean of its divisors is an integer number (101657761611).

Almost surely, 2^203315523221 is an apocalyptic number.

It is an amenable number.

203315523221 is a deficient number, since it is larger than the sum of its proper divisors (1).

203315523221 is an equidigital number, since it uses as much as digits as its factorization.

203315523221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 29.

The spelling of 203315523221 in words is "two hundred three billion, three hundred fifteen million, five hundred twenty-three thousand, two hundred twenty-one".