212212212021 has 6 divisors (see below), whose sum is σ = 306528750710. Its totient is φ = 141474808008.

The previous prime is 212212212013. The next prime is 212212212031. The reversal of 212212212021 is 120212212212.

It is a happy number.

212212212021 is a `hidden beast` number, since 21 + 221 + 221 + 202 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 201456447921 + 10755764100 = 448839^2 + 103710^2 .

It is not a de Polignac number, because 212212212021 - 2³ = 212212212013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212212211985 and 212212212003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212212212031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11789567326 + ... + 11789567343.

Almost surely, 2^212212212021 is an apocalyptic number.

It is an amenable number.

212212212021 is a deficient number, since it is larger than the sum of its proper divisors (94316538689).

212212212021 is a wasteful number, since it uses less digits than its factorization.

212212212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23579134675 (or 23579134672 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 212212212021 its reverse (120212212212), we get a palindrome (332424424233).

The spelling of 212212212021 in words is "two hundred twelve billion, two hundred twelve million, two hundred twelve thousand, twenty-one".