212212300021 has 4 divisors (see below), whose sum is σ = 212265080044. Its totient is φ = 212159520000.

The previous prime is 212212299977. The next prime is 212212300073. The reversal of 212212300021 is 120003212212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 104077212100 + 108135087921 = 322610^2 + 328839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212212300021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212212299968 and 212212300004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212212330021) 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, 26383980 + ... + 26392021.

It is an arithmetic number, because the mean of its divisors is an integer number (53066270011).

Almost surely, 2^212212300021 is an apocalyptic number.

It is an amenable number.

212212300021 is a deficient number, since it is larger than the sum of its proper divisors (52780023).

212212300021 is an equidigital number, since it uses as much as digits as its factorization.

212212300021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52780022.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 212212300021 its reverse (120003212212), we get a palindrome (332215512233).

The spelling of 212212300021 in words is "two hundred twelve billion, two hundred twelve million, three hundred thousand, twenty-one".