211203131311 has 4 divisors (see below), whose sum is σ = 211216131112. Its totient is φ = 211190131512.

The previous prime is 211203131309. The next prime is 211203131383. The reversal of 211203131311 is 113131302112.

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

It is a cyclic number.

It is not a de Polignac number, because 211203131311 - 2¹ = 211203131309 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 (211203131011) 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, 6475500 + ... + 6508033.

It is an arithmetic number, because the mean of its divisors is an integer number (52804032778).

Almost surely, 2^211203131311 is an apocalyptic number.

211203131311 is a deficient number, since it is larger than the sum of its proper divisors (12999801).

211203131311 is a wasteful number, since it uses less digits than its factorization.

211203131311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12999800.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 211203131311 its reverse (113131302112), we get a palindrome (324334433423).

The spelling of 211203131311 in words is "two hundred eleven billion, two hundred three million, one hundred thirty-one thousand, three hundred eleven".