213111321211 has 4 divisors (see below), whose sum is σ = 214050137832. Its totient is φ = 212172504592.

The previous prime is 213111321209. The next prime is 213111321217. The reversal of 213111321211 is 112123111312.

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 213111321211 - 2¹ = 213111321209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213111321217) 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, 469407970 + ... + 469408423.

It is an arithmetic number, because the mean of its divisors is an integer number (53512534458).

Almost surely, 2^213111321211 is an apocalyptic number.

213111321211 is a deficient number, since it is larger than the sum of its proper divisors (938816621).

213111321211 is an equidigital number, since it uses as much as digits as its factorization.

213111321211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938816620.

The product of its digits is 72, while the sum is 19.

Adding to 213111321211 its reverse (112123111312), we get a palindrome (325234432523).

The spelling of 213111321211 in words is "two hundred thirteen billion, one hundred eleven million, three hundred twenty-one thousand, two hundred eleven".