21330790087 has 2 divisors, whose sum is σ = 21330790088. Its totient is φ = 21330790086.

The previous prime is 21330790049. The next prime is 21330790099. The reversal of 21330790087 is 78009703312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21330790087 - 2⁷ = 21330789959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21330790037) 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, 10665395043 + 10665395044.

It is an arithmetic number, because the mean of its divisors is an integer number (10665395044).

Almost surely, 2^21330790087 is an apocalyptic number.

21330790087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21330790087 is an equidigital number, since it uses as much as digits as its factorization.

21330790087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 40.

The spelling of 21330790087 in words is "twenty-one billion, three hundred thirty million, seven hundred ninety thousand, eighty-seven".