121000203 has 32 divisors (see below), whose sum is σ = 190771200. Its totient is φ = 75535488.

The previous prime is 121000199. The next prime is 121000211. The reversal of 121000203 is 302000121.

It is a happy number.

It is not a de Polignac number, because 121000203 - 2² = 121000199 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (121000213) 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 in 31 ways as a sum of consecutive naturals, for example, 109150 + ... + 110252.

It is an arithmetic number, because the mean of its divisors is an integer number (5961600).

Almost surely, 2^121000203 is an apocalyptic number.

121000203 is a deficient number, since it is larger than the sum of its proper divisors (69770997).

121000203 is a wasteful number, since it uses less digits than its factorization.

121000203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368 (or 1362 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 121000203 is about 11000.0092272689. The cubic root of 121000203 is about 494.6090209241.

Adding to 121000203 its reverse (302000121), we get a palindrome (423000324).

The spelling of 121000203 in words is "one hundred twenty-one million, two hundred three", and thus it is an aban number.