21879024 has 40 divisors (see below), whose sum is σ = 57093072. Its totient is φ = 7219200.

The previous prime is 21879019. The next prime is 21879041. The reversal of 21879024 is 42097812.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 2592 + ... + 7104.

Almost surely, 2^21879024 is an apocalyptic number.

21879024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21879024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28546536).

21879024 is an abundant number, since it is smaller than the sum of its proper divisors (35214048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21879024 is a wasteful number, since it uses less digits than its factorization.

21879024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4625 (or 4619 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 21879024 is about 4677.5018973807. The cubic root of 21879024 is about 279.6893834377.

It can be divided in two parts, 2187 and 9024, that added together give a palindrome (11211).

The spelling of 21879024 in words is "twenty-one million, eight hundred seventy-nine thousand, twenty-four".