1200121110203 has 4 divisors (see below), whose sum is σ = 1200131583288. Its totient is φ = 1200110637120.

The previous prime is 1200121110193. The next prime is 1200121110217. The reversal of 1200121110203 is 3020111210021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1200121110203 - 2¹⁰ = 1200121109179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1200121110263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5062733 + ... + 5294478.

It is an arithmetic number, because the mean of its divisors is an integer number (300032895822).

Almost surely, 2^{1200121110203} is an apocalyptic number.

1200121110203 is a deficient number, since it is larger than the sum of its proper divisors (10473085).

1200121110203 is a wasteful number, since it uses less digits than its factorization.

1200121110203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10473084.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 1200121110203 its reverse (3020111210021), we get a palindrome (4220232320224).

The spelling of 1200121110203 in words is "one trillion, two hundred billion, one hundred twenty-one million, one hundred ten thousand, two hundred three".