21050110 has 32 divisors (see below), whose sum is σ = 38817792. Its totient is φ = 8217120.

The previous prime is 21050101. The next prime is 21050111. The reversal of 21050110 is 1105012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050111) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 110115 + ... + 110305.

It is an arithmetic number, because the mean of its divisors is an integer number (1213056).

Almost surely, 2^21050110 is an apocalyptic number.

21050110 is a deficient number, since it is larger than the sum of its proper divisors (17767682).

21050110 is a wasteful number, since it uses less digits than its factorization.

21050110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408.

The product of its (nonzero) digits is 10, while the sum is 10.

The square root of 21050110 is about 4588.0398864875. The cubic root of 21050110 is about 276.1116872772. Note that the first 3 decimals are identical.

Adding to 21050110 its reverse (1105012), we get a palindrome (22155122).

The spelling of 21050110 in words is "twenty-one million, fifty thousand, one hundred ten".