212779321 has 2 divisors, whose sum is σ = 212779322. Its totient is φ = 212779320.

The previous prime is 212779313. The next prime is 212779373. The reversal of 212779321 is 123977212.

212779321 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., 152250921 + 60528400 = 12339^2 + 7780^2 .

It is a cyclic number.

It is not a de Polignac number, because 212779321 - 2³ = 212779313 is a prime.

It is not a weakly prime, because it can be changed into another prime (212779121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106389660 + 106389661.

It is an arithmetic number, because the mean of its divisors is an integer number (106389661).

Almost surely, 2^212779321 is an apocalyptic number.

It is an amenable number.

212779321 is a deficient number, since it is larger than the sum of its proper divisors (1).

212779321 is an equidigital number, since it uses as much as digits as its factorization.

212779321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 34.

The square root of 212779321 is about 14586.9572221214. The cubic root of 212779321 is about 597.0029441685.

The spelling of 212779321 in words is "two hundred twelve million, seven hundred seventy-nine thousand, three hundred twenty-one".