21148562087 has 2 divisors, whose sum is σ = 21148562088. Its totient is φ = 21148562086.

The previous prime is 21148562081. The next prime is 21148562089. The reversal of 21148562087 is 78026584112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21148562087 - 2¹⁴ = 21148545703 is a prime.

Together with 21148562089, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21148562081) 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, 10574281043 + 10574281044.

It is an arithmetic number, because the mean of its divisors is an integer number (10574281044).

Almost surely, 2^21148562087 is an apocalyptic number.

21148562087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21148562087 is an equidigital number, since it uses as much as digits as its factorization.

21148562087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 21148562087 in words is "twenty-one billion, one hundred forty-eight million, five hundred sixty-two thousand, eighty-seven".