21719712 has 48 divisors (see below), whose sum is σ = 65161152. Its totient is φ = 6205440.

The previous prime is 21719699. The next prime is 21719741. The reversal of 21719712 is 21791712.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21719712.

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 7 ways as a sum of consecutive naturals, for example, 15489 + ... + 16832.

It is an arithmetic number, because the mean of its divisors is an integer number (1357524).

Almost surely, 2^21719712 is an apocalyptic number.

It is an amenable number.

21719712 is an abundant number, since it is smaller than the sum of its proper divisors (43441440).

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

21719712 is a wasteful number, since it uses less digits than its factorization.

21719712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32341 (or 32333 counting only the distinct ones).

The product of its digits is 1764, while the sum is 30.

The square root of 21719712 is about 4660.4411808326. The cubic root of 21719712 is about 279.0088767875.

The spelling of 21719712 in words is "twenty-one million, seven hundred nineteen thousand, seven hundred twelve".