1021100987 has 2 divisors, whose sum is σ = 1021100988. Its totient is φ = 1021100986.

The previous prime is 1021100981. The next prime is 1021101001. The reversal of 1021100987 is 7890011201.

It is a weak prime.

It is an emirp because it is prime and its reverse (7890011201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021100987 is a prime.

It is a super-3 number, since 3×1021100987³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1021100981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510550493 + 510550494.

It is an arithmetic number, because the mean of its divisors is an integer number (510550494).

Almost surely, 2^1021100987 is an apocalyptic number.

1021100987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021100987 is an equidigital number, since it uses as much as digits as its factorization.

1021100987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 1021100987 is about 31954.6708166428. The cubic root of 1021100987 is about 1006.9847618470.

The spelling of 1021100987 in words is "one billion, twenty-one million, one hundred thousand, nine hundred eighty-seven".