200231021 has 2 divisors, whose sum is σ = 200231022. Its totient is φ = 200231020.

The previous prime is 200230969. The next prime is 200231023. The reversal of 200231021 is 120132002.

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., 149108521 + 51122500 = 12211^2 + 7150^2 .

It is a cyclic number.

It is not a de Polignac number, because 200231021 - 2²² = 196036717 is a prime.

Together with 200231023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 200230993 and 200231011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200231023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100115510 + 100115511.

It is an arithmetic number, because the mean of its divisors is an integer number (100115511).

Almost surely, 2^200231021 is an apocalyptic number.

It is an amenable number.

200231021 is a deficient number, since it is larger than the sum of its proper divisors (1).

200231021 is an equidigital number, since it uses as much as digits as its factorization.

200231021 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 200231021 is about 14150.3010922030. The cubic root of 200231021 is about 585.0286308339.

Adding to 200231021 its reverse (120132002), we get a palindrome (320363023).

The spelling of 200231021 in words is "two hundred million, two hundred thirty-one thousand, twenty-one".