203012003221 has 2 divisors, whose sum is σ = 203012003222. Its totient is φ = 203012003220.

The previous prime is 203012003191. The next prime is 203012003267. The reversal of 203012003221 is 122300210302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198225300625 + 4786702596 = 445225^2 + 69186^2 .

It is a cyclic number.

It is not a de Polignac number, because 203012003221 - 2⁹ = 203012002709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 203012003195 and 203012003204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203012003921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101506001610 + 101506001611.

It is an arithmetic number, because the mean of its divisors is an integer number (101506001611).

Almost surely, 2^203012003221 is an apocalyptic number.

It is an amenable number.

203012003221 is a deficient number, since it is larger than the sum of its proper divisors (1).

203012003221 is an equidigital number, since it uses as much as digits as its factorization.

203012003221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 203012003221 its reverse (122300210302), we get a palindrome (325312213523).

The spelling of 203012003221 in words is "two hundred three billion, twelve million, three thousand, two hundred twenty-one".