213121131211 has 32 divisors (see below), whose sum is σ = 225911524608. Its totient is φ = 200808706560.

The previous prime is 213121131199. The next prime is 213121131239. The reversal of 213121131211 is 112131121312.

It is not a de Polignac number, because 213121131211 - 2¹¹ = 213121129163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213121131271) 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, 178642431 + ... + 178643623.

It is an arithmetic number, because the mean of its divisors is an integer number (7059735144).

Almost surely, 2^213121131211 is an apocalyptic number.

213121131211 is a deficient number, since it is larger than the sum of its proper divisors (12790393397).

213121131211 is a wasteful number, since it uses less digits than its factorization.

213121131211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2331.

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

Adding to 213121131211 its reverse (112131121312), we get a palindrome (325252252523).

The spelling of 213121131211 in words is "two hundred thirteen billion, one hundred twenty-one million, one hundred thirty-one thousand, two hundred eleven".