21859441 has 8 divisors (see below), whose sum is σ = 22376160. Its totient is φ = 21347712.

The previous prime is 21859429. The next prime is 21859447. The reversal of 21859441 is 14495812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21859441 - 2⁹ = 21858929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21859397 and 21859406.

It is not an unprimeable number, because it can be changed into a prime (21859447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8481 + ... + 10753.

It is an arithmetic number, because the mean of its divisors is an integer number (2797020).

Almost surely, 2^21859441 is an apocalyptic number.

It is an amenable number.

21859441 is a deficient number, since it is larger than the sum of its proper divisors (516719).

21859441 is a wasteful number, since it uses less digits than its factorization.

21859441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2495.

The product of its digits is 11520, while the sum is 34.

The square root of 21859441 is about 4675.4081105290. The cubic root of 21859441 is about 279.6059124362.

The spelling of 21859441 in words is "twenty-one million, eight hundred fifty-nine thousand, four hundred forty-one".