203102021 has 2 divisors, whose sum is σ = 203102022. Its totient is φ = 203102020.

The previous prime is 203101999. The next prime is 203102041. The reversal of 203102021 is 120201302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106296100 + 96805921 = 10310^2 + 9839^2 .

It is a cyclic number.

It is not a de Polignac number, because 203102021 - 2²² = 198907717 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 203101993 and 203102011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203102041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101551010 + 101551011.

It is an arithmetic number, because the mean of its divisors is an integer number (101551011).

Almost surely, 2^203102021 is an apocalyptic number.

It is an amenable number.

203102021 is a deficient number, since it is larger than the sum of its proper divisors (1).

203102021 is an equidigital number, since it uses as much as digits as its factorization.

203102021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 203102021 is about 14251.3866342893. The cubic root of 203102021 is about 587.8115043990.

Adding to 203102021 its reverse (120201302), we get a palindrome (323303323).

The spelling of 203102021 in words is "two hundred three million, one hundred two thousand, twenty-one".