21075296 has 36 divisors (see below), whose sum is σ = 45615276. Its totient is φ = 9577920.

The previous prime is 21075283. The next prime is 21075347. The reversal of 21075296 is 69257012.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1151 + ... + 6593.

It is an arithmetic number, because the mean of its divisors is an integer number (1267091).

Almost surely, 2^21075296 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 21075296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22807638).

21075296 is an abundant number, since it is smaller than the sum of its proper divisors (24539980).

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

21075296 is a wasteful number, since it uses less digits than its factorization.

21075296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5475 (or 5456 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 21075296 is about 4590.7838110719. The cubic root of 21075296 is about 276.2217639356.

The spelling of 21075296 in words is "twenty-one million, seventy-five thousand, two hundred ninety-six".