212121101211 has 4 divisors (see below), whose sum is σ = 282828134952. Its totient is φ = 141414067472.

The previous prime is 212121101197. The next prime is 212121101219. The reversal of 212121101211 is 112101121212.

It is a happy number.

212121101211 is nontrivially palindromic in base 11.

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 212121101211 - 2³⁰ = 211047359387 is a prime.

It is a super-3 number, since 3×212121101211³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (212121101219) 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, 35353516866 + ... + 35353516871.

It is an arithmetic number, because the mean of its divisors is an integer number (70707033738).

Almost surely, 2^212121101211 is an apocalyptic number.

212121101211 is a deficient number, since it is larger than the sum of its proper divisors (70707033741).

212121101211 is an equidigital number, since it uses as much as digits as its factorization.

212121101211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70707033740.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 212121101211 its reverse (112101121212), we get a palindrome (324222222423).

The spelling of 212121101211 in words is "two hundred twelve billion, one hundred twenty-one million, one hundred one thousand, two hundred eleven".