211213231213 has 4 divisors (see below), whose sum is σ = 211226907708. Its totient is φ = 211199554720.

The previous prime is 211213231181. The next prime is 211213231247. The reversal of 211213231213 is 312132312112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 63939191044 + 147274040169 = 252862^2 + 383763^2 .

It is a cyclic number.

It is not a de Polignac number, because 211213231213 - 2⁵ = 211213231181 is a prime.

It is a super-2 number, since 2×211213231213² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211213231613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6815056 + ... + 6845977.

It is an arithmetic number, because the mean of its divisors is an integer number (52806726927).

Almost surely, 2^211213231213 is an apocalyptic number.

It is an amenable number.

211213231213 is a deficient number, since it is larger than the sum of its proper divisors (13676495).

211213231213 is a wasteful number, since it uses less digits than its factorization.

211213231213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13676494.

The product of its digits is 432, while the sum is 22.

Adding to 211213231213 its reverse (312132312112), we get a palindrome (523345543325).

The spelling of 211213231213 in words is "two hundred eleven billion, two hundred thirteen million, two hundred thirty-one thousand, two hundred thirteen".