1010387821 has 2 divisors, whose sum is σ = 1010387822. Its totient is φ = 1010387820.

The previous prime is 1010387797. The next prime is 1010387827. The reversal of 1010387821 is 1287830101.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1010349796 + 38025 = 31786^2 + 195^2 .

It is an emirp because it is prime and its reverse (1287830101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1010387821 - 2⁵ = 1010387789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1010387827) 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, 505193910 + 505193911.

It is an arithmetic number, because the mean of its divisors is an integer number (505193911).

Almost surely, 2^1010387821 is an apocalyptic number.

It is an amenable number.

1010387821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1010387821 is an equidigital number, since it uses as much as digits as its factorization.

1010387821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 1010387821 is about 31786.5981350631. The cubic root of 1010387821 is about 1003.4506860696.

The spelling of 1010387821 in words is "one billion, ten million, three hundred eighty-seven thousand, eight hundred twenty-one".