21244110 has 16 divisors (see below), whose sum is σ = 50985936. Its totient is φ = 5665088.

The previous prime is 21244073. The next prime is 21244121. The reversal of 21244110 is 1144212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21244110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 354039 + ... + 354098.

It is an arithmetic number, because the mean of its divisors is an integer number (3186621).

Almost surely, 2^21244110 is an apocalyptic number.

21244110 is an abundant number, since it is smaller than the sum of its proper divisors (29741826).

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

21244110 is a wasteful number, since it uses less digits than its factorization.

21244110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708147.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 21244110 is about 4609.1333241728. The cubic root of 21244110 is about 276.9573194242.

Adding to 21244110 its reverse (1144212), we get a palindrome (22388322).

The spelling of 21244110 in words is "twenty-one million, two hundred forty-four thousand, one hundred ten".