212121312311 has 4 divisors (see below), whose sum is σ = 212122397352. Its totient is φ = 212120227272.

The previous prime is 212121312289. The next prime is 212121312331. The reversal of 212121312311 is 113213121212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 212121312311 - 2³⁴ = 194941443127 is a prime.

It is a super-2 number, since 2×212121312311² (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 (212121312331) 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, 158816 + ... + 670421.

It is an arithmetic number, because the mean of its divisors is an integer number (53030599338).

Almost surely, 2^212121312311 is an apocalyptic number.

212121312311 is a deficient number, since it is larger than the sum of its proper divisors (1085041).

212121312311 is an equidigital number, since it uses as much as digits as its factorization.

212121312311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085040.

The product of its digits is 144, while the sum is 20.

Adding to 212121312311 its reverse (113213121212), we get a palindrome (325334433523).

The spelling of 212121312311 in words is "two hundred twelve billion, one hundred twenty-one million, three hundred twelve thousand, three hundred eleven".