212021109979 has 4 divisors (see below), whose sum is σ = 242309839984. Its totient is φ = 181732379976.

The previous prime is 212021109931. The next prime is 212021110019. The reversal of 212021109979 is 979901120212.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 212021109979 - 2⁷ = 212021109851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212021107979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15144364992 + ... + 15144365005.

It is an arithmetic number, because the mean of its divisors is an integer number (60577459996).

Almost surely, 2^212021109979 is an apocalyptic number.

212021109979 is a deficient number, since it is larger than the sum of its proper divisors (30288730005).

212021109979 is an equidigital number, since it uses as much as digits as its factorization.

212021109979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30288730004.

The product of its (nonzero) digits is 40824, while the sum is 43.

The spelling of 212021109979 in words is "two hundred twelve billion, twenty-one million, one hundred nine thousand, nine hundred seventy-nine".