21448874 has 4 divisors (see below), whose sum is σ = 32173314. Its totient is φ = 10724436.

The previous prime is 21448871. The next prime is 21448877. The reversal of 21448874 is 47884412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21448871) and next prime (21448877).

It can be written as a sum of positive squares in only one way, i.e., 20025625 + 1423249 = 4475^2 + 1193^2 .

It is not an unprimeable number, because it can be changed into a prime (21448871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5362217 + ... + 5362220.

Almost surely, 2^21448874 is an apocalyptic number.

21448874 is a deficient number, since it is larger than the sum of its proper divisors (10724440).

21448874 is a wasteful number, since it uses less digits than its factorization.

21448874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10724439.

The product of its digits is 57344, while the sum is 38.

The square root of 21448874 is about 4631.2929080333. The cubic root of 21448874 is about 277.8443049308.

It can be divided in two parts, 21448 and 874, that added together give a palindrome (22322).

The spelling of 21448874 in words is "twenty-one million, four hundred forty-eight thousand, eight hundred seventy-four".