212915321 has 2 divisors, whose sum is σ = 212915322. Its totient is φ = 212915320.

The previous prime is 212915299. The next prime is 212915357. The reversal of 212915321 is 123519212.

It is a happy number.

212915321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130759225 + 82156096 = 11435^2 + 9064^2 .

It is a cyclic number.

It is not a de Polignac number, because 212915321 - 2¹⁰ = 212914297 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (212912321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106457660 + 106457661.

It is an arithmetic number, because the mean of its divisors is an integer number (106457661).

Almost surely, 2^212915321 is an apocalyptic number.

It is an amenable number.

212915321 is a deficient number, since it is larger than the sum of its proper divisors (1).

212915321 is an equidigital number, since it uses as much as digits as its factorization.

212915321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 26.

The square root of 212915321 is about 14591.6181761996. The cubic root of 212915321 is about 597.1301105176.

The spelling of 212915321 in words is "two hundred twelve million, nine hundred fifteen thousand, three hundred twenty-one".