203131103221 has 2 divisors, whose sum is σ = 203131103222. Its totient is φ = 203131103220.

The previous prime is 203131103209. The next prime is 203131103239. The reversal of 203131103221 is 122301131302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104902140996 + 98228962225 = 323886^2 + 313415^2 .

It is a cyclic number.

It is not a de Polignac number, because 203131103221 - 2¹³ = 203131095029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203131103261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101565551610 + 101565551611.

It is an arithmetic number, because the mean of its divisors is an integer number (101565551611).

Almost surely, 2^203131103221 is an apocalyptic number.

It is an amenable number.

203131103221 is a deficient number, since it is larger than the sum of its proper divisors (1).

203131103221 is an equidigital number, since it uses as much as digits as its factorization.

203131103221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 203131103221 its reverse (122301131302), we get a palindrome (325432234523).

The spelling of 203131103221 in words is "two hundred three billion, one hundred thirty-one million, one hundred three thousand, two hundred twenty-one".