212121011213 has 4 divisors (see below), whose sum is σ = 213669339900. Its totient is φ = 210572682528.

The previous prime is 212121011171. The next prime is 212121011227. The reversal of 212121011213 is 312110121212.

It is a happy number.

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 115808854249 + 96312156964 = 340307^2 + 310342^2 .

It is a cyclic number.

It is not a de Polignac number, because 212121011213 - 2⁶ = 212121011149 is a prime.

It is a super-3 number, since 3×212121011213³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212121011191 and 212121011200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121014213) 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, 774164138 + ... + 774164411.

It is an arithmetic number, because the mean of its divisors is an integer number (53417334975).

Almost surely, 2^212121011213 is an apocalyptic number.

It is an amenable number.

212121011213 is a deficient number, since it is larger than the sum of its proper divisors (1548328687).

212121011213 is a wasteful number, since it uses less digits than its factorization.

212121011213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548328686.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 212121011213 its reverse (312110121212), we get a palindrome (524231132425).

The spelling of 212121011213 in words is "two hundred twelve billion, one hundred twenty-one million, eleven thousand, two hundred thirteen".