21321102102109 has 8 divisors (see below), whose sum is σ = 21673461972600. Its totient is φ = 20968833638400.

The previous prime is 21321102102073. The next prime is 21321102102137. The reversal of 21321102102109 is 90120120112312.

It can be written as a sum of positive squares in 4 ways, for example, as 225425544100 + 21095676558009 = 474790^2 + 4593003^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21321102102109 - 2⁹ = 21321102101597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321102102809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22381252 + ... + 23314429.

It is an arithmetic number, because the mean of its divisors is an integer number (2709182746575).

Almost surely, 2^{21321102102109} is an apocalyptic number.

It is an amenable number.

21321102102109 is a deficient number, since it is larger than the sum of its proper divisors (352359870491).

21321102102109 is an equidigital number, since it uses as much as digits as its factorization.

21321102102109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45703391.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 21321102102109 in words is "twenty-one trillion, three hundred twenty-one billion, one hundred two million, one hundred two thousand, one hundred nine".