21854441 has 6 divisors (see below), whose sum is σ = 25422570. Its totient is φ = 18732336.

The previous prime is 21854431. The next prime is 21854461. The reversal of 21854441 is 14445812.

It can be written as a sum of positive squares in only one way, i.e., 20894041 + 960400 = 4571^2 + 980^2 .

It is not a de Polignac number, because 21854441 - 2¹⁴ = 21838057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21854431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 222956 + ... + 223053.

It is an arithmetic number, because the mean of its divisors is an integer number (4237095).

Almost surely, 2^21854441 is an apocalyptic number.

It is an amenable number.

21854441 is a deficient number, since it is larger than the sum of its proper divisors (3568129).

21854441 is an equidigital number, since it uses as much as digits as its factorization.

21854441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446023 (or 446016 counting only the distinct ones).

The product of its digits is 5120, while the sum is 29.

The square root of 21854441 is about 4674.8733672689. The cubic root of 21854441 is about 279.5845923398.

The spelling of 21854441 in words is "twenty-one million, eight hundred fifty-four thousand, four hundred forty-one".