1000021101979 has 2 divisors, whose sum is σ = 1000021101980. Its totient is φ = 1000021101978.

The previous prime is 1000021101953. The next prime is 1000021102127. The reversal of 1000021101979 is 9791011200001.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1000021101979 - 2⁹ = 1000021101467 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1000021101979.

It is not a weakly prime, because it can be changed into another prime (1000021101179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500010550989 + 500010550990.

It is an arithmetic number, because the mean of its divisors is an integer number (500010550990).

Almost surely, 2^{1000021101979} is an apocalyptic number.

1000021101979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000021101979 is an equidigital number, since it uses as much as digits as its factorization.

1000021101979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 31.

The spelling of 1000021101979 in words is "one trillion, twenty-one million, one hundred one thousand, nine hundred seventy-nine".