200121123 has 16 divisors (see below), whose sum is σ = 280730016. Its totient is φ = 126639360.

The previous prime is 200121113. The next prime is 200121169. The reversal of 200121123 is 321121002.

It is not a de Polignac number, because 200121123 - 2⁴ = 200121107 is a prime.

It is a super-2 number, since 2×200121123² = 80096927741562258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 200121099 and 200121108.

It is not an unprimeable number, because it can be changed into a prime (200121113) 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 in 15 ways as a sum of consecutive naturals, for example, 17436 + ... + 26537.

It is an arithmetic number, because the mean of its divisors is an integer number (17545626).

Almost surely, 2^200121123 is an apocalyptic number.

200121123 is a deficient number, since it is larger than the sum of its proper divisors (80608893).

200121123 is a wasteful number, since it uses less digits than its factorization.

200121123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44054.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 200121123 is about 14146.4173202970. The cubic root of 200121123 is about 584.9215790854.

Adding to 200121123 its reverse (321121002), we get a palindrome (521242125).

The spelling of 200121123 in words is "two hundred million, one hundred twenty-one thousand, one hundred twenty-three".