21073888 has 96 divisors (see below), whose sum is σ = 50077440. Its totient is φ = 8616960.

The previous prime is 21073879. The next prime is 21073889. The reversal of 21073888 is 88837012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21073889) 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 in 15 ways as a sum of consecutive naturals, for example, 153756 + ... + 153892.

It is an arithmetic number, because the mean of its divisors is an integer number (521640).

Almost surely, 2^21073888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21073888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25038720).

21073888 is an abundant number, since it is smaller than the sum of its proper divisors (29003552).

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

21073888 is a wasteful number, since it uses less digits than its factorization.

21073888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 21073888 is about 4590.6304577912. The cubic root of 21073888 is about 276.2156125170.

It can be divided in two parts, 2107 and 3888, that added together give a palindrome (5995).

The spelling of 21073888 in words is "twenty-one million, seventy-three thousand, eight hundred eighty-eight".