212212122021 has 20 divisors (see below), whose sum is σ = 317563481664. Its totient is φ = 141226950600.

The previous prime is 212212122011. The next prime is 212212122029. The reversal of 212212122021 is 120221212212.

It is a happy number.

212212122021 is a `hidden beast` number, since 212 + 212 + 1 + 220 + 21 = 666.

It is not a de Polignac number, because 212212122021 - 2¹⁵ = 212212089253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212212121985 and 212212122003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212212122029) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2247885 + ... + 2340386.

Almost surely, 2^212212122021 is an apocalyptic number.

It is an amenable number.

212212122021 is a deficient number, since it is larger than the sum of its proper divisors (105351359643).

212212122021 is an equidigital number, since it uses as much as digits as its factorization.

212212122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4588854 (or 4588845 counting only the distinct ones).

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

Adding to 212212122021 its reverse (120221212212), we get a palindrome (332433334233).

The spelling of 212212122021 in words is "two hundred twelve billion, two hundred twelve million, one hundred twenty-two thousand, twenty-one".