21210101102087 has 2 divisors, whose sum is σ = 21210101102088. Its totient is φ = 21210101102086.

The previous prime is 21210101102063. The next prime is 21210101102131. The reversal of 21210101102087 is 78020110101212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21210101102087 - 2¹⁴ = 21210101085703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210101102587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605050551043 + 10605050551044.

It is an arithmetic number, because the mean of its divisors is an integer number (10605050551044).

Almost surely, 2^{21210101102087} is an apocalyptic number.

21210101102087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210101102087 is an equidigital number, since it uses as much as digits as its factorization.

21210101102087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 26.

Adding to 21210101102087 its reverse (78020110101212), we get a palindrome (99230211203299).

The spelling of 21210101102087 in words is "twenty-one trillion, two hundred ten billion, one hundred one million, one hundred two thousand, eighty-seven".