21241888 has 24 divisors (see below), whose sum is σ = 42532560. Its totient is φ = 10440000.

The previous prime is 21241877. The next prime is 21241889. The reversal of 21241888 is 88814212.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21241889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3738 + ... + 7513.

It is an arithmetic number, because the mean of its divisors is an integer number (1772190).

Almost surely, 2^21241888 is an apocalyptic number.

It is an amenable number.

21241888 is an abundant number, since it is smaller than the sum of its proper divisors (21290672).

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

21241888 is a wasteful number, since it uses less digits than its factorization.

21241888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11320 (or 11312 counting only the distinct ones).

The product of its digits is 8192, while the sum is 34.

The square root of 21241888 is about 4608.8922747229. The cubic root of 21241888 is about 276.9476630909.

It can be divided in two parts, 2 and 1241888, that multiplied together give a square (2483776 = 1576²).

The spelling of 21241888 in words is "twenty-one million, two hundred forty-one thousand, eight hundred eighty-eight".