21067488 has 144 divisors (see below), whose sum is σ = 68520816. Its totient is φ = 6082560.

The previous prime is 21067477. The next prime is 21067493. The reversal of 21067488 is 88476012.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 63483 + ... + 63813.

It is an arithmetic number, because the mean of its divisors is an integer number (475839).

Almost surely, 2^21067488 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 21067488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34260408).

21067488 is an abundant number, since it is smaller than the sum of its proper divisors (47453328).

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

21067488 is a wasteful number, since it uses less digits than its factorization.

21067488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 21067488 is about 4589.9333328492. The cubic root of 21067488 is about 276.1876480695.

The spelling of 21067488 in words is "twenty-one million, sixty-seven thousand, four hundred eighty-eight".