12212109979 has 4 divisors (see below), whose sum is σ = 12384111600. Its totient is φ = 12040108360.

The previous prime is 12212109971. The next prime is 12212110003. The reversal of 12212109979 is 97990121221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97990121221 = 80473 ⋅1217677.

It is a cyclic number.

It is not a de Polignac number, because 12212109979 - 2³ = 12212109971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12212109971) 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, 86000704 + ... + 86000845.

It is an arithmetic number, because the mean of its divisors is an integer number (3096027900).

Almost surely, 2^12212109979 is an apocalyptic number.

12212109979 is a deficient number, since it is larger than the sum of its proper divisors (172001621).

12212109979 is an equidigital number, since it uses as much as digits as its factorization.

12212109979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172001620.

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

The spelling of 12212109979 in words is "twelve billion, two hundred twelve million, one hundred nine thousand, nine hundred seventy-nine".