1211232121203 has 16 divisors (see below), whose sum is σ = 1740716199936. Its totient is φ = 744725997600.

The previous prime is 1211232121199. The next prime is 1211232121207. The reversal of 1211232121203 is 3021212321121.

It is an interprime number because it is at equal distance from previous prime (1211232121199) and next prime (1211232121207).

It is not a de Polignac number, because 1211232121203 - 2² = 1211232121199 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211232121203.

It is not an unprimeable number, because it can be changed into a prime (1211232121207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13446525 + ... + 13536302.

It is an arithmetic number, because the mean of its divisors is an integer number (108794762496).

Almost surely, 2^{1211232121203} is an apocalyptic number.

1211232121203 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1211232121203 is a deficient number, since it is larger than the sum of its proper divisors (529484078733).

1211232121203 is a wasteful number, since it uses less digits than its factorization.

1211232121203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26983994.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1211232121203 its reverse (3021212321121), we get a palindrome (4232444442324).

The spelling of 1211232121203 in words is "one trillion, two hundred eleven billion, two hundred thirty-two million, one hundred twenty-one thousand, two hundred three".