21244118 has 16 divisors (see below), whose sum is σ = 38561184. Its totient is φ = 8568960.

The previous prime is 21244073. The next prime is 21244121. The reversal of 21244118 is 81144212.

It is a junction number, because it is equal to n+sod(n) for n = 21244093 and 21244102.

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, 44393 + ... + 44868.

It is an arithmetic number, because the mean of its divisors is an integer number (2410074).

Almost surely, 2^21244118 is an apocalyptic number.

21244118 is a deficient number, since it is larger than the sum of its proper divisors (17317066).

21244118 is a wasteful number, since it uses less digits than its factorization.

21244118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89287.

The product of its digits is 512, while the sum is 23.

The square root of 21244118 is about 4609.1341920148. The cubic root of 21244118 is about 276.9573541893.

The spelling of 21244118 in words is "twenty-one million, two hundred forty-four thousand, one hundred eighteen".