1211020231303 has 4 divisors (see below), whose sum is σ = 1211241346920. Its totient is φ = 1210799115688.

The previous prime is 1211020231279. The next prime is 1211020231313. The reversal of 1211020231303 is 3031320201121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211020231303 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 (1211020231313) 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, 110549593 + ... + 110560546.

It is an arithmetic number, because the mean of its divisors is an integer number (302810336730).

Almost surely, 2^{1211020231303} is an apocalyptic number.

1211020231303 is a deficient number, since it is larger than the sum of its proper divisors (221115617).

1211020231303 is an equidigital number, since it uses as much as digits as its factorization.

1211020231303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221115616.

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

Adding to 1211020231303 its reverse (3031320201121), we get a palindrome (4242340432424).

The spelling of 1211020231303 in words is "one trillion, two hundred eleven billion, twenty million, two hundred thirty-one thousand, three hundred three".