21675552 has 48 divisors (see below), whose sum is σ = 58296672. Its totient is φ = 7047680.

The previous prime is 21675529. The next prime is 21675553. The reversal of 21675552 is 25557612.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (21675553) 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 7 ways as a sum of consecutive naturals, for example, 1183 + ... + 6689.

It is an arithmetic number, because the mean of its divisors is an integer number (1214514).

Almost surely, 2^21675552 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 21675552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29148336).

21675552 is an abundant number, since it is smaller than the sum of its proper divisors (36621120).

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

21675552 is a wasteful number, since it uses less digits than its factorization.

21675552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5561 (or 5553 counting only the distinct ones).

The product of its digits is 21000, while the sum is 33.

The square root of 21675552 is about 4655.7010213286. The cubic root of 21675552 is about 278.8196570943.

The spelling of 21675552 in words is "twenty-one million, six hundred seventy-five thousand, five hundred fifty-two".