1203121021103 has 4 divisors (see below), whose sum is σ = 1203123228840. Its totient is φ = 1203118813368.

The previous prime is 1203121021093. The next prime is 1203121021121. The reversal of 1203121021103 is 3011201213021.

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 1203121021103 - 2⁸ = 1203121020847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1203121021163) 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, 365768 + ... + 1593746.

It is an arithmetic number, because the mean of its divisors is an integer number (300780807210).

Almost surely, 2^{1203121021103} is an apocalyptic number.

1203121021103 is a deficient number, since it is larger than the sum of its proper divisors (2207737).

1203121021103 is an equidigital number, since it uses as much as digits as its factorization.

1203121021103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2207736.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1203121021103 its reverse (3011201213021), we get a palindrome (4214322234124).

The spelling of 1203121021103 in words is "one trillion, two hundred three billion, one hundred twenty-one million, twenty-one thousand, one hundred three".