200121994 has 16 divisors (see below), whose sum is σ = 318573000. Its totient is φ = 93958144.

The previous prime is 200121991. The next prime is 200122031. The reversal of 200121994 is 499121002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 188046369 + 12075625 = 13713^2 + 3475^2 .

It is not an unprimeable number, because it can be changed into a prime (200121991) 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 7 ways as a sum of consecutive naturals, for example, 8712 + ... + 21820.

Almost surely, 2^200121994 is an apocalyptic number.

200121994 is a deficient number, since it is larger than the sum of its proper divisors (118451006).

200121994 is a wasteful number, since it uses less digits than its factorization.

200121994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13577.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 200121994 is about 14146.4481054433. The cubic root of 200121994 is about 584.9224276814.

Adding to 200121994 its reverse (499121002), we get a palindrome (699242996).

The spelling of 200121994 in words is "two hundred million, one hundred twenty-one thousand, nine hundred ninety-four".