21321120860087 has 2 divisors, whose sum is σ = 21321120860088. Its totient is φ = 21321120860086.

The previous prime is 21321120860069. The next prime is 21321120860131. The reversal of 21321120860087 is 78006802112312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21321120860087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21321120860057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660560430043 + 10660560430044.

It is an arithmetic number, because the mean of its divisors is an integer number (10660560430044).

Almost surely, 2^{21321120860087} is an apocalyptic number.

21321120860087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321120860087 is an equidigital number, since it uses as much as digits as its factorization.

21321120860087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 41.

Adding to 21321120860087 its reverse (78006802112312), we get a palindrome (99327922972399).

The spelling of 21321120860087 in words is "twenty-one trillion, three hundred twenty-one billion, one hundred twenty million, eight hundred sixty thousand, eighty-seven".