212023320021 has 6 divisors (see below), whose sum is σ = 306255906710.
Its totient is φ = 141348880008.
The previous prime is 212023320013. The next prime is 212023320023. The reversal of 212023320021 is 120023320212.
Adding to 212023320021 its reverse (120023320212), we get a palindrome (332046640233).
212023320021 is a `hidden beast` number, since 212 + 0 + 233 + 200 + 21 = 666.
It can be written as a sum of positive squares in only one way, i.e., 197770541796 + 14252778225 = 444714^2 + 119385^2
It is not a de Polignac number, because 212023320021 - 23 = 212023320013 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 212023319976 and 212023320003.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (212023320023) 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, 11779073326 + ... + 11779073343.
Almost surely, 2212023320021 is an apocalyptic number.
It is an amenable number.
212023320021 is a deficient number, since it is larger than the sum of its proper divisors (94232586689).
212023320021 is a wasteful number, since it uses less digits than its factorization.
212023320021 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 23558146675 (or 23558146672 counting only the distinct ones).
The product of its (nonzero) digits is 288, while the sum is 18.
The spelling of 212023320021 in words is "two hundred twelve billion, twenty-three million, three hundred twenty thousand, twenty-one".