21412760 has 16 divisors (see below), whose sum is σ = 48178800. Its totient is φ = 8565088.

The previous prime is 21412739. The next prime is 21412789. The reversal of 21412760 is 6721412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267620 + ... + 267699.

It is an arithmetic number, because the mean of its divisors is an integer number (3011175).

Almost surely, 2^21412760 is an apocalyptic number.

21412760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21412760 is an abundant number, since it is smaller than the sum of its proper divisors (26766040).

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

21412760 is a wasteful number, since it uses less digits than its factorization.

21412760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535330 (or 535326 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 21412760 is about 4627.3923542315. The cubic root of 21412760 is about 277.6882795525.

The spelling of 21412760 in words is "twenty-one million, four hundred twelve thousand, seven hundred sixty".