21100233320989 has 2 divisors, whose sum is σ = 21100233320990. Its totient is φ = 21100233320988.

The previous prime is 21100233320987. The next prime is 21100233321047. The reversal of 21100233320989 is 98902333200112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20211093705625 + 889139615364 = 4495675^2 + 942942^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100233320989 - 2¹ = 21100233320987 is a prime.

Together with 21100233320987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100233320987) 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, 10550116660494 + 10550116660495.

It is an arithmetic number, because the mean of its divisors is an integer number (10550116660495).

Almost surely, 2^{21100233320989} is an apocalyptic number.

It is an amenable number.

21100233320989 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100233320989 is an equidigital number, since it uses as much as digits as its factorization.

21100233320989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 43.

The spelling of 21100233320989 in words is "twenty-one trillion, one hundred billion, two hundred thirty-three million, three hundred twenty thousand, nine hundred eighty-nine".