200021123 has 2 divisors, whose sum is σ = 200021124. Its totient is φ = 200021122.

The previous prime is 200021117. The next prime is 200021153. The reversal of 200021123 is 321120002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 200021123 - 2⁸ = 200020867 is a prime.

It is a super-2 number, since 2×200021123² = 80016899292362258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (200021153) 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, 100010561 + 100010562.

It is an arithmetic number, because the mean of its divisors is an integer number (100010562).

Almost surely, 2^200021123 is an apocalyptic number.

200021123 is a deficient number, since it is larger than the sum of its proper divisors (1).

200021123 is an equidigital number, since it uses as much as digits as its factorization.

200021123 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 200021123 is about 14142.8824148403. The cubic root of 200021123 is about 584.8241349267.

Adding to 200021123 its reverse (321120002), we get a palindrome (521141125).

The spelling of 200021123 in words is "two hundred million, twenty-one thousand, one hundred twenty-three".