1211303310013 has 4 divisors (see below), whose sum is σ = 1250377610368. Its totient is φ = 1172229009660.

The previous prime is 1211303309873. The next prime is 1211303310023. The reversal of 1211303310013 is 3100133031121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211303310013 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 (1211303310023) 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, 19537150131 + ... + 19537150192.

It is an arithmetic number, because the mean of its divisors is an integer number (312594402592).

Almost surely, 2^{1211303310013} is an apocalyptic number.

It is an amenable number.

1211303310013 is a deficient number, since it is larger than the sum of its proper divisors (39074300355).

1211303310013 is an equidigital number, since it uses as much as digits as its factorization.

1211303310013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39074300354.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 1211303310013 its reverse (3100133031121), we get a palindrome (4311436341134).

The spelling of 1211303310013 in words is "one trillion, two hundred eleven billion, three hundred three million, three hundred ten thousand, thirteen".