21847874 has 8 divisors (see below), whose sum is σ = 32847120. Its totient is φ = 10898836.

The previous prime is 21847867. The next prime is 21847879. The reversal of 21847874 is 47874812.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21847879) 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 3 ways as a sum of consecutive naturals, for example, 11444 + ... + 13215.

It is an arithmetic number, because the mean of its divisors is an integer number (4105890).

Almost surely, 2^21847874 is an apocalyptic number.

21847874 is a deficient number, since it is larger than the sum of its proper divisors (10999246).

21847874 is a wasteful number, since it uses less digits than its factorization.

21847874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25104.

The product of its digits is 100352, while the sum is 41.

The square root of 21847874 is about 4674.1709425309. The cubic root of 21847874 is about 279.5565855844.

The spelling of 21847874 in words is "twenty-one million, eight hundred forty-seven thousand, eight hundred seventy-four".