21016110 has 16 divisors (see below), whose sum is σ = 50438736. Its totient is φ = 5604288.

The previous prime is 21016103. The next prime is 21016123. The reversal of 21016110 is 1161012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350239 + ... + 350298.

It is an arithmetic number, because the mean of its divisors is an integer number (3152421).

Almost surely, 2^21016110 is an apocalyptic number.

21016110 is an abundant number, since it is smaller than the sum of its proper divisors (29422626).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21016110 is a wasteful number, since it uses less digits than its factorization.

21016110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700547.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 21016110 is about 4584.3331030805. Note that the first 3 decimals coincide. The cubic root of 21016110 is about 275.9629492378.

Adding to 21016110 its reverse (1161012), we get a palindrome (22177122).

The spelling of 21016110 in words is "twenty-one million, sixteen thousand, one hundred ten".