203581021313 has 2 divisors, whose sum is σ = 203581021314. Its totient is φ = 203581021312.

The previous prime is 203581021253. The next prime is 203581021321. The reversal of 203581021313 is 313120185302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200303687809 + 3277333504 = 447553^2 + 57248^2 .

It is a cyclic number.

It is not a de Polignac number, because 203581021313 - 2¹⁰ = 203581020289 is a prime.

It is not a weakly prime, because it can be changed into another prime (203581024313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101790510656 + 101790510657.

It is an arithmetic number, because the mean of its divisors is an integer number (101790510657).

Almost surely, 2^203581021313 is an apocalyptic number.

It is an amenable number.

203581021313 is a deficient number, since it is larger than the sum of its proper divisors (1).

203581021313 is an equidigital number, since it uses as much as digits as its factorization.

203581021313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 203581021313 in words is "two hundred three billion, five hundred eighty-one million, twenty-one thousand, three hundred thirteen".