21841652 has 36 divisors (see below), whose sum is σ = 45428544. Its totient is φ = 9157680.

The previous prime is 21841649. The next prime is 21841661. The reversal of 21841652 is 25614812.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 8027 + ... + 10397.

It is an arithmetic number, because the mean of its divisors is an integer number (1261904).

Almost surely, 2^21841652 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 21841652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22714272).

21841652 is an abundant number, since it is smaller than the sum of its proper divisors (23586892).

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

21841652 is a wasteful number, since it uses less digits than its factorization.

21841652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2436 (or 2427 counting only the distinct ones).

The product of its digits is 3840, while the sum is 29.

The square root of 21841652 is about 4673.5053225604. The cubic root of 21841652 is about 279.5300449971.

The spelling of 21841652 in words is "twenty-one million, eight hundred forty-one thousand, six hundred fifty-two".