1021111000999 has 2 divisors, whose sum is σ = 1021111001000. Its totient is φ = 1021111000998.

The previous prime is 1021111000981. The next prime is 1021111001041. The reversal of 1021111000999 is 9990001111201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021111000999 - 2¹¹ = 1021110998951 is a prime.

It is a super-2 number, since 2×1021111000999² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021111000939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510555500499 + 510555500500.

It is an arithmetic number, because the mean of its divisors is an integer number (510555500500).

Almost surely, 2^{1021111000999} is an apocalyptic number.

1021111000999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021111000999 is an equidigital number, since it uses as much as digits as its factorization.

1021111000999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 34.

The spelling of 1021111000999 in words is "one trillion, twenty-one billion, one hundred eleven million, nine hundred ninety-nine", and thus it is an aban number.