21110226 has 32 divisors (see below), whose sum is σ = 45385920. Its totient is φ = 6521856.

The previous prime is 21110189. The next prime is 21110227. The reversal of 21110226 is 62201112.

It is not an unprimeable number, because it can be changed into a prime (21110227) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5290 + ... + 8378.

It is an arithmetic number, because the mean of its divisors is an integer number (1418310).

Almost surely, 2^21110226 is an apocalyptic number.

21110226 is an abundant number, since it is smaller than the sum of its proper divisors (24275694).

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

21110226 is a wasteful number, since it uses less digits than its factorization.

21110226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3178.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 21110226 is about 4594.5865972903. The cubic root of 21110226 is about 276.3742821686.

Adding to 21110226 its reverse (62201112), we get a palindrome (83311338).

The spelling of 21110226 in words is "twenty-one million, one hundred ten thousand, two hundred twenty-six".