203021010221 has 2 divisors, whose sum is σ = 203021010222. Its totient is φ = 203021010220.

The previous prime is 203021010191. The next prime is 203021010277. The reversal of 203021010221 is 122010120302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189104089321 + 13916920900 = 434861^2 + 117970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203021010221 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 203021010196 and 203021010205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203029010221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101510505110 + 101510505111.

It is an arithmetic number, because the mean of its divisors is an integer number (101510505111).

Almost surely, 2^203021010221 is an apocalyptic number.

It is an amenable number.

203021010221 is a deficient number, since it is larger than the sum of its proper divisors (1).

203021010221 is an equidigital number, since it uses as much as digits as its factorization.

203021010221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 203021010221 its reverse (122010120302), we get a palindrome (325031130523).

The spelling of 203021010221 in words is "two hundred three billion, twenty-one million, ten thousand, two hundred twenty-one".