1211023313311 has 8 divisors (see below), whose sum is σ = 1384033901184. Its totient is φ = 1038014539800.

The previous prime is 1211023313309. The next prime is 1211023313317. The reversal of 1211023313311 is 1133133201121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211023313311 - 2¹ = 1211023313309 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 (1211023313317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1591296 + ... + 2225818.

It is an arithmetic number, because the mean of its divisors is an integer number (173004237648).

Almost surely, 2^{1211023313311} is an apocalyptic number.

1211023313311 is a deficient number, since it is larger than the sum of its proper divisors (173010587873).

1211023313311 is an equidigital number, since it uses as much as digits as its factorization.

1211023313311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907181.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 1211023313311 its reverse (1133133201121), we get a palindrome (2344156514432).

The spelling of 1211023313311 in words is "one trillion, two hundred eleven billion, twenty-three million, three hundred thirteen thousand, three hundred eleven".