213109979 has 8 divisors (see below), whose sum is σ = 220192992. Its totient is φ = 206140480.

The previous prime is 213109961. The next prime is 213109991. The reversal of 213109979 is 979901312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213109979 - 2⁸ = 213109723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213109579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24554 + ... + 32079.

It is an arithmetic number, because the mean of its divisors is an integer number (27524124).

Almost surely, 2^213109979 is an apocalyptic number.

213109979 is a deficient number, since it is larger than the sum of its proper divisors (7083013).

213109979 is an equidigital number, since it uses as much as digits as its factorization.

213109979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56757.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 213109979 is about 14598.2868515453. The cubic root of 213109979 is about 597.3120306467.

The spelling of 213109979 in words is "two hundred thirteen million, one hundred nine thousand, nine hundred seventy-nine".