87002909821 has 2 divisors, whose sum is σ = 87002909822. Its totient is φ = 87002909820.

The previous prime is 87002909801. The next prime is 87002909839. The reversal of 87002909821 is 12890920078.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73075605625 + 13927304196 = 270325^2 + 118014^2 .

It is a cyclic number.

It is not a de Polignac number, because 87002909821 - 2¹⁷ = 87002778749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87002909801) 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, 43501454910 + 43501454911.

It is an arithmetic number, because the mean of its divisors is an integer number (43501454911).

Almost surely, 2^87002909821 is an apocalyptic number.

It is an amenable number.

87002909821 is a deficient number, since it is larger than the sum of its proper divisors (1).

87002909821 is an equidigital number, since it uses as much as digits as its factorization.

87002909821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 46.

The spelling of 87002909821 in words is "eighty-seven billion, two million, nine hundred nine thousand, eight hundred twenty-one".