21102012110987 has 2 divisors, whose sum is σ = 21102012110988. Its totient is φ = 21102012110986.

The previous prime is 21102012110953. The next prime is 21102012111023. The reversal of 21102012110987 is 78901121020112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21102012110987 - 2⁶ = 21102012110923 is a prime.

It is a super-2 number, since 2×21102012110987² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21102012110287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551006055493 + 10551006055494.

It is an arithmetic number, because the mean of its divisors is an integer number (10551006055494).

Almost surely, 2^{21102012110987} is an apocalyptic number.

21102012110987 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102012110987 is an equidigital number, since it uses as much as digits as its factorization.

21102012110987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 35.

The spelling of 21102012110987 in words is "twenty-one trillion, one hundred two billion, twelve million, one hundred ten thousand, nine hundred eighty-seven".