21000110 has 8 divisors (see below), whose sum is σ = 37800216. Its totient is φ = 8400040.

The previous prime is 21000103. The next prime is 21000121. The reversal of 21000110 is 1100012.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (5).

It is a junction number, because it is equal to n+sod(n) for n = 21000094 and 21000103.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1049996 + ... + 1050015.

It is an arithmetic number, because the mean of its divisors is an integer number (4725027).

Almost surely, 2^21000110 is an apocalyptic number.

21000110 is a deficient number, since it is larger than the sum of its proper divisors (16800106).

21000110 is a wasteful number, since it uses less digits than its factorization.

21000110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100018.

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 21000110 is about 4582.5876969241. The cubic root of 21000110 is about 275.8928993542.

Adding to 21000110 its reverse (1100012), we get a palindrome (22100122).

The spelling of 21000110 in words is "twenty-one million, one hundred ten", and thus it is an aban number.