21075760 has 40 divisors (see below), whose sum is σ = 49193280. Its totient is φ = 8397312.

The previous prime is 21075749. The next prime is 21075773. The reversal of 21075760 is 6757012.

21075760 = 796² + 797² + ... + 827².

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36756 + ... + 37324.

It is an arithmetic number, because the mean of its divisors is an integer number (1229832).

Almost surely, 2^21075760 is an apocalyptic number.

21075760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21075760 is an abundant number, since it is smaller than the sum of its proper divisors (28117520).

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

21075760 is a wasteful number, since it uses less digits than its factorization.

21075760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045 (or 1039 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 21075760 is about 4590.8343468263. The cubic root of 21075760 is about 276.2237910477.

The spelling of 21075760 in words is "twenty-one million, seventy-five thousand, seven hundred sixty".