200121012 has 216 divisors, whose sum is σ = 648001536. Its totient is φ = 50948352.

The previous prime is 200121007. The next prime is 200121013. The reversal of 200121012 is 210121002.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 200120985 and 200121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121013) 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 71 ways as a sum of consecutive naturals, for example, 1575693 + ... + 1575819.

Almost surely, 2^200121012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 200121012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324000768).

200121012 is an abundant number, since it is smaller than the sum of its proper divisors (447880524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

200121012 is a wasteful number, since it uses less digits than its factorization.

200121012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 200121012 is about 14146.4133970417. The cubic root of 200121012 is about 584.9214709404.

Adding to 200121012 its reverse (210121002), we get a palindrome (410242014).

The spelling of 200121012 in words is "two hundred million, one hundred twenty-one thousand, twelve".