210099979 has 2 divisors, whose sum is σ = 210099980. Its totient is φ = 210099978.

The previous prime is 210099977. The next prime is 210100013. The reversal of 210099979 is 979990012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 210099979 - 2¹ = 210099977 is a prime.

Together with 210099977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (210099971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105049989 + 105049990.

It is an arithmetic number, because the mean of its divisors is an integer number (105049990).

Almost surely, 2^210099979 is an apocalyptic number.

210099979 is a deficient number, since it is larger than the sum of its proper divisors (1).

210099979 is an equidigital number, since it uses as much as digits as its factorization.

210099979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91854, while the sum is 46.

The square root of 210099979 is about 14494.8259389342. The cubic root of 210099979 is about 594.4865084651.

The spelling of 210099979 in words is "two hundred ten million, ninety-nine thousand, nine hundred seventy-nine".