21430304182087 has 2 divisors, whose sum is σ = 21430304182088. Its totient is φ = 21430304182086.

The previous prime is 21430304182051. The next prime is 21430304182127. The reversal of 21430304182087 is 78028140303412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21430304182087 - 2⁷ = 21430304181959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21430304189087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10715152091043 + 10715152091044.

It is an arithmetic number, because the mean of its divisors is an integer number (10715152091044).

Almost surely, 2^{21430304182087} is an apocalyptic number.

21430304182087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21430304182087 is an equidigital number, since it uses as much as digits as its factorization.

21430304182087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 258048, while the sum is 43.

Adding to 21430304182087 its reverse (78028140303412), we get a palindrome (99458444485499).

The spelling of 21430304182087 in words is "twenty-one trillion, four hundred thirty billion, three hundred four million, one hundred eighty-two thousand, eighty-seven".