1211031320213 has 32 divisors (see below), whose sum is σ = 1474238223360. Its totient is φ = 979588431360.

The previous prime is 1211031320179. The next prime is 1211031320237. The reversal of 1211031320213 is 3120231301121.

It is a happy number.

It is not a de Polignac number, because 1211031320213 - 2⁸ = 1211031319957 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 (1211031320263) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2276681 + ... + 2757777.

It is an arithmetic number, because the mean of its divisors is an integer number (46069944480).

Almost surely, 2^{1211031320213} is an apocalyptic number.

1211031320213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1211031320213 is a deficient number, since it is larger than the sum of its proper divisors (263206903147).

1211031320213 is a wasteful number, since it uses less digits than its factorization.

1211031320213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481757.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1211031320213 its reverse (3120231301121), we get a palindrome (4331262621334).

The spelling of 1211031320213 in words is "one trillion, two hundred eleven billion, thirty-one million, three hundred twenty thousand, two hundred thirteen".