212009939 has 2 divisors, whose sum is σ = 212009940. Its totient is φ = 212009938.

The previous prime is 212009881. The next prime is 212009957. The reversal of 212009939 is 939900212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212009939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212009899 and 212009908.

It is not a weakly prime, because it can be changed into another prime (212009989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106004969 + 106004970.

It is an arithmetic number, because the mean of its divisors is an integer number (106004970).

Almost surely, 2^212009939 is an apocalyptic number.

212009939 is a deficient number, since it is larger than the sum of its proper divisors (1).

212009939 is an equidigital number, since it uses as much as digits as its factorization.

212009939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 212009939 is about 14560.5610812221. The cubic root of 212009939 is about 596.2825138037.

The spelling of 212009939 in words is "two hundred twelve million, nine thousand, nine hundred thirty-nine".