212003021221 has 2 divisors, whose sum is σ = 212003021222. Its totient is φ = 212003021220.

The previous prime is 212003021173. The next prime is 212003021239. The reversal of 212003021221 is 122120300212.

It is a happy number.

212003021221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176589050625 + 35413970596 = 420225^2 + 188186^2 .

It is a cyclic number.

It is not a de Polignac number, because 212003021221 - 2²⁹ = 211466150309 is a prime.

It is a super-3 number, since 3×212003021221³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212003021195 and 212003021204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212003021521) 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 as a sum of consecutive naturals, namely, 106001510610 + 106001510611.

It is an arithmetic number, because the mean of its divisors is an integer number (106001510611).

Almost surely, 2^212003021221 is an apocalyptic number.

It is an amenable number.

212003021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

212003021221 is an equidigital number, since it uses as much as digits as its factorization.

212003021221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 212003021221 its reverse (122120300212), we get a palindrome (334123321433).

The spelling of 212003021221 in words is "two hundred twelve billion, three million, twenty-one thousand, two hundred twenty-one".