212122099979 has 4 divisors (see below), whose sum is σ = 224599870584. Its totient is φ = 199644329376.

The previous prime is 212122099963. The next prime is 212122100039. The reversal of 212122099979 is 979990221212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 212122099979 - 2⁴ = 212122099963 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212122099979.

It is not an unprimeable number, because it can be changed into a prime (212122090979) 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, 6238885277 + ... + 6238885310.

It is an arithmetic number, because the mean of its divisors is an integer number (56149967646).

Almost surely, 2^212122099979 is an apocalyptic number.

212122099979 is a deficient number, since it is larger than the sum of its proper divisors (12477770605).

212122099979 is a wasteful number, since it uses less digits than its factorization.

212122099979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12477770604.

The product of its (nonzero) digits is 734832, while the sum is 53.

The spelling of 212122099979 in words is "two hundred twelve billion, one hundred twenty-two million, ninety-nine thousand, nine hundred seventy-nine".