21869443 has 8 divisors (see below), whose sum is σ = 22356000. Its totient is φ = 21385728.

The previous prime is 21869423. The next prime is 21869461. The reversal of 21869443 is 34496812.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21869443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21869423) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 23338 + ... + 24256.

It is an arithmetic number, because the mean of its divisors is an integer number (2794500).

Almost surely, 2^21869443 is an apocalyptic number.

21869443 is a deficient number, since it is larger than the sum of its proper divisors (486557).

21869443 is an equidigital number, since it uses as much as digits as its factorization.

21869443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421.

The product of its digits is 41472, while the sum is 37.

The square root of 21869443 is about 4676.4776274457. The cubic root of 21869443 is about 279.6485514025.

The spelling of 21869443 in words is "twenty-one million, eight hundred sixty-nine thousand, four hundred forty-three".