1212121303 has 4 divisors (see below), whose sum is σ = 1212194680. Its totient is φ = 1212047928.

The previous prime is 1212121291. The next prime is 1212121307. The reversal of 1212121303 is 3031212121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212121303 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 (1212121307) 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, 988 + ... + 49246.

It is an arithmetic number, because the mean of its divisors is an integer number (303048670).

Almost surely, 2^1212121303 is an apocalyptic number.

1212121303 is a deficient number, since it is larger than the sum of its proper divisors (73377).

1212121303 is an equidigital number, since it uses as much as digits as its factorization.

1212121303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73376.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1212121303 is about 34815.5324962868. The cubic root of 1212121303 is about 1066.2245909082.

Adding to 1212121303 its reverse (3031212121), we get a palindrome (4243333424).

The spelling of 1212121303 in words is "one billion, two hundred twelve million, one hundred twenty-one thousand, three hundred three".