121312203103 has 18 divisors (see below), whose sum is σ = 152808558984. Its totient is φ = 95983275024.

The previous prime is 121312203059. The next prime is 121312203107. The reversal of 121312203103 is 301302213121.

It is not a de Polignac number, because 121312203103 - 2²¹ = 121310105951 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 (121312203107) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7316451 + ... + 7333012.

It is an arithmetic number, because the mean of its divisors is an integer number (8489364388).

Almost surely, 2^121312203103 is an apocalyptic number.

121312203103 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121312203103 is a deficient number, since it is larger than the sum of its proper divisors (31496355881).

121312203103 is a wasteful number, since it uses less digits than its factorization.

121312203103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14649503 (or 14649483 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 121312203103 its reverse (301302213121), we get a palindrome (422614416224).

It can be divided in two parts, 121312 and 203103, that added together give a triangular number (324415 = T₈₀₅).

The spelling of 121312203103 in words is "one hundred twenty-one billion, three hundred twelve million, two hundred three thousand, one hundred three".