1211033231213 has 4 divisors (see below), whose sum is σ = 1304189633628. Its totient is φ = 1117876828800.

The previous prime is 1211033231209. The next prime is 1211033231269. The reversal of 1211033231213 is 3121323301121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 791126639209 + 419906592004 = 889453^2 + 648002^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211033231213 - 2² = 1211033231209 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 (1211033233213) 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, 46578201188 + ... + 46578201213.

It is an arithmetic number, because the mean of its divisors is an integer number (326047408407).

Almost surely, 2^{1211033231213} is an apocalyptic number.

1211033231213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1211033231213 is a deficient number, since it is larger than the sum of its proper divisors (93156402415).

1211033231213 is an equidigital number, since it uses as much as digits as its factorization.

1211033231213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93156402414.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1211033231213 its reverse (3121323301121), we get a palindrome (4332356532334).

The spelling of 1211033231213 in words is "one trillion, two hundred eleven billion, thirty-three million, two hundred thirty-one thousand, two hundred thirteen".