21100108389 has 4 divisors (see below), whose sum is σ = 28133477856. Its totient is φ = 14066738924.

The previous prime is 21100108369. The next prime is 21100108411. The reversal of 21100108389 is 98380100112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21100108389 - 2⁵ = 21100108357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100108339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3516684729 + ... + 3516684734.

It is an arithmetic number, because the mean of its divisors is an integer number (7033369464).

Almost surely, 2^21100108389 is an apocalyptic number.

It is an amenable number.

21100108389 is a deficient number, since it is larger than the sum of its proper divisors (7033369467).

21100108389 is an equidigital number, since it uses as much as digits as its factorization.

21100108389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7033369466.

The product of its (nonzero) digits is 3456, while the sum is 33.

The spelling of 21100108389 in words is "twenty-one billion, one hundred million, one hundred eight thousand, three hundred eighty-nine".