1016908021 has 2 divisors, whose sum is σ = 1016908022. Its totient is φ = 1016908020.

The previous prime is 1016908019. The next prime is 1016908033. The reversal of 1016908021 is 1208096101.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 678863025 + 338044996 = 26055^2 + 18386^2 .

It is an emirp because it is prime and its reverse (1208096101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1016908021 - 2¹ = 1016908019 is a prime.

Together with 1016908019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1016908001) 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, 508454010 + 508454011.

It is an arithmetic number, because the mean of its divisors is an integer number (508454011).

Almost surely, 2^1016908021 is an apocalyptic number.

It is an amenable number.

1016908021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1016908021 is an equidigital number, since it uses as much as digits as its factorization.

1016908021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 1016908021 is about 31888.9952961833. The cubic root of 1016908021 is about 1005.6045374786.

The spelling of 1016908021 in words is "one billion, sixteen million, nine hundred eight thousand, twenty-one".