212121111213331 has 4 divisors (see below), whose sum is σ = 212184792126664. Its totient is φ = 212057430300000.

The previous prime is 212121111213317. The next prime is 212121111213337. The reversal of 212121111213331 is 133312111121212.

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 212121111213331 - 2¹³ = 212121111205139 is a prime.

It is a super-2 number, since 2×212121111213331² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212121111213296 and 212121111213305.

It is not an unprimeable number, because it can be changed into a prime (212121111213337) 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, 31840451670 + ... + 31840458331.

It is an arithmetic number, because the mean of its divisors is an integer number (53046198031666).

Almost surely, 2^{212121111213331} is an apocalyptic number.

212121111213331 is a deficient number, since it is larger than the sum of its proper divisors (63680913333).

212121111213331 is an equidigital number, since it uses as much as digits as its factorization.

212121111213331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63680913332.

The product of its digits is 432, while the sum is 25.

Adding to 212121111213331 its reverse (133312111121212), we get a palindrome (345433222334543).

The spelling of 212121111213331 in words is "two hundred twelve trillion, one hundred twenty-one billion, one hundred eleven million, two hundred thirteen thousand, three hundred thirty-one".