210000021109 has 4 divisors (see below), whose sum is σ = 210001755040. Its totient is φ = 209998287180.

The previous prime is 210000021107. The next prime is 210000021149. The reversal of 210000021109 is 901120000012.

210000021109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 210000021109 - 2¹ = 210000021107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210000021092 and 210000021101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210000021107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 670449 + ... + 932470.

It is an arithmetic number, because the mean of its divisors is an integer number (52500438760).

Almost surely, 2^210000021109 is an apocalyptic number.

It is an amenable number.

210000021109 is a deficient number, since it is larger than the sum of its proper divisors (1733931).

210000021109 is a wasteful number, since it uses less digits than its factorization.

210000021109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1733930.

The product of its (nonzero) digits is 36, while the sum is 16.

The spelling of 210000021109 in words is "two hundred ten billion, twenty-one thousand, one hundred nine".