1001220199979 has 2 divisors, whose sum is σ = 1001220199980. Its totient is φ = 1001220199978.

The previous prime is 1001220199939. The next prime is 1001220199997. The reversal of 1001220199979 is 9799910221001.

Together with next prime (1001220199997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1001220199979 - 2²⁰ = 1001219151403 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001220199939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500610099989 + 500610099990.

It is an arithmetic number, because the mean of its divisors is an integer number (500610099990).

Almost surely, 2^{1001220199979} is an apocalyptic number.

1001220199979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001220199979 is an equidigital number, since it uses as much as digits as its factorization.

1001220199979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183708, while the sum is 50.

The spelling of 1001220199979 in words is "one trillion, one billion, two hundred twenty million, one hundred ninety-nine thousand, nine hundred seventy-nine".