21841416 has 48 divisors (see below), whose sum is σ = 60135660. Its totient is φ = 7159680.

The previous prime is 21841409. The next prime is 21841427. The reversal of 21841416 is 61414812.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20738916 + 1102500 = 4554^2 + 1050^2 .

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21841416.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1906 + ... + 6878.

Almost surely, 2^21841416 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21841416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30067830).

21841416 is an abundant number, since it is smaller than the sum of its proper divisors (38294244).

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

21841416 is a wasteful number, since it uses less digits than its factorization.

21841416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5046 (or 5039 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 21841416 is about 4673.4800737780. The cubic root of 21841416 is about 279.5290382154.

It can be divided in two parts, 2184 and 1416, that added together give a square (3600 = 60²).

The spelling of 21841416 in words is "twenty-one million, eight hundred forty-one thousand, four hundred sixteen".