21100233320987 has 2 divisors, whose sum is σ = 21100233320988. Its totient is φ = 21100233320986.

The previous prime is 21100233320953. The next prime is 21100233320989. The reversal of 21100233320987 is 78902333200112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21100233320987 - 2¹⁴ = 21100233304603 is a prime.

Together with 21100233320989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21100233320989) 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, 10550116660493 + 10550116660494.

It is an arithmetic number, because the mean of its divisors is an integer number (10550116660494).

Almost surely, 2^{21100233320987} is an apocalyptic number.

21100233320987 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100233320987 is an equidigital number, since it uses as much as digits as its factorization.

21100233320987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 41.

The spelling of 21100233320987 in words is "twenty-one trillion, one hundred billion, two hundred thirty-three million, three hundred twenty thousand, nine hundred eighty-seven".