12421111979 has 2 divisors, whose sum is σ = 12421111980. Its totient is φ = 12421111978.

The previous prime is 12421111907. The next prime is 12421112017. The reversal of 12421111979 is 97911112421.

It is an a-pointer prime, because the next prime (12421112017) can be obtained adding 12421111979 to its sum of digits (38).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12421111979 is a prime.

It is not a weakly prime, because it can be changed into another prime (12421111579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6210555989 + 6210555990.

It is an arithmetic number, because the mean of its divisors is an integer number (6210555990).

Almost surely, 2^12421111979 is an apocalyptic number.

12421111979 is a deficient number, since it is larger than the sum of its proper divisors (1).

12421111979 is an equidigital number, since it uses as much as digits as its factorization.

12421111979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 38.

The spelling of 12421111979 in words is "twelve billion, four hundred twenty-one million, one hundred eleven thousand, nine hundred seventy-nine".