212002020222221 has 4 divisors (see below), whose sum is σ = 212002968233244. Its totient is φ = 212001072211200.

The previous prime is 212002020222143. The next prime is 212002020222229. The reversal of 212002020222221 is 122222020200212.

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 123302147222500 + 88699872999721 = 11104150^2 + 9418061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212002020222221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212002020222193 and 212002020222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212002020222229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 473669990 + ... + 474117351.

It is an arithmetic number, because the mean of its divisors is an integer number (53000742058311).

Almost surely, 2^{212002020222221} is an apocalyptic number.

It is an amenable number.

212002020222221 is a deficient number, since it is larger than the sum of its proper divisors (948011023).

212002020222221 is an equidigital number, since it uses as much as digits as its factorization.

212002020222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 948011022.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 212002020222221 its reverse (122222020200212), we get a palindrome (334224040422433).

The spelling of 212002020222221 in words is "two hundred twelve trillion, two billion, twenty million, two hundred twenty-two thousand, two hundred twenty-one".