21144032087 has 2 divisors, whose sum is σ = 21144032088. Its totient is φ = 21144032086.

The previous prime is 21144032083. The next prime is 21144032101. The reversal of 21144032087 is 78023044112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21144032087 - 2² = 21144032083 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21144032083) 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, 10572016043 + 10572016044.

It is an arithmetic number, because the mean of its divisors is an integer number (10572016044).

Almost surely, 2^21144032087 is an apocalyptic number.

21144032087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21144032087 is an equidigital number, since it uses as much as digits as its factorization.

21144032087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 32.

Adding to 21144032087 its reverse (78023044112), we get a palindrome (99167076199).

The spelling of 21144032087 in words is "twenty-one billion, one hundred forty-four million, thirty-two thousand, eighty-seven".