212212021 has 8 divisors (see below), whose sum is σ = 242645760. Its totient is φ = 181807728.

The previous prime is 212211997. The next prime is 212212051. The reversal of 212212021 is 120212212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212212021 - 2⁹ = 212211509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212211992 and 212212010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212212051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11220 + ... + 23458.

It is an arithmetic number, because the mean of its divisors is an integer number (30330720).

Almost surely, 2^212212021 is an apocalyptic number.

It is an amenable number.

212212021 is a deficient number, since it is larger than the sum of its proper divisors (30433739).

212212021 is a wasteful number, since it uses less digits than its factorization.

212212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14723.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 212212021 is about 14567.4987901149. The cubic root of 212212021 is about 596.4719069656.

Adding to 212212021 its reverse (120212212), we get a palindrome (332424233).

The spelling of 212212021 in words is "two hundred twelve million, two hundred twelve thousand, twenty-one".