21201100109 has 8 divisors (see below), whose sum is σ = 24255917760. Its totient is φ = 18152804736.

The previous prime is 21201100091. The next prime is 21201100111. The reversal of 21201100109 is 90100110212.

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 21201100109 - 2⁸ = 21201099853 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201100169) 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, 1623599 + ... + 1636604.

It is an arithmetic number, because the mean of its divisors is an integer number (3031989720).

Almost surely, 2^21201100109 is an apocalyptic number.

It is an amenable number.

21201100109 is a deficient number, since it is larger than the sum of its proper divisors (3054817651).

21201100109 is an equidigital number, since it uses as much as digits as its factorization.

21201100109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3261139.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 21201100109 in words is "twenty-one billion, two hundred one million, one hundred thousand, one hundred nine".