101220099979 has 2 divisors, whose sum is σ = 101220099980. Its totient is φ = 101220099978.

The previous prime is 101220099899. The next prime is 101220100117. The reversal of 101220099979 is 979990022101.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101220099979 - 2¹¹ = 101220097931 is a prime.

It is not a weakly prime, because it can be changed into another prime (101220099479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50610049989 + 50610049990.

It is an arithmetic number, because the mean of its divisors is an integer number (50610049990).

Almost surely, 2^101220099979 is an apocalyptic number.

101220099979 is a deficient number, since it is larger than the sum of its proper divisors (1).

101220099979 is an equidigital number, since it uses as much as digits as its factorization.

101220099979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 183708, while the sum is 49.

The spelling of 101220099979 in words is "one hundred one billion, two hundred twenty million, ninety-nine thousand, nine hundred seventy-nine".