21411724 has 12 divisors (see below), whose sum is σ = 37503648. Its totient is φ = 10696400.

The previous prime is 21411713. The next prime is 21411737. The reversal of 21411724 is 42711412.

It is a junction number, because it is equal to n+sod(n) for n = 21411695 and 21411704.

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, 6054 + ... + 8914.

It is an arithmetic number, because the mean of its divisors is an integer number (3125304).

Almost surely, 2^21411724 is an apocalyptic number.

It is an amenable number.

21411724 is a deficient number, since it is larger than the sum of its proper divisors (16091924).

21411724 is a wasteful number, since it uses less digits than its factorization.

21411724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4736 (or 4734 counting only the distinct ones).

The product of its digits is 448, while the sum is 22.

The square root of 21411724 is about 4627.2804107813. The cubic root of 21411724 is about 277.6838010749.

The spelling of 21411724 in words is "twenty-one million, four hundred eleven thousand, seven hundred twenty-four".