21241696 has 144 divisors (see below), whose sum is σ = 55157760. Its totient is φ = 7983360.

The previous prime is 21241667. The next prime is 21241723. The reversal of 21241696 is 69614212.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 685201 + ... + 685231.

It is an arithmetic number, because the mean of its divisors is an integer number (383040).

Almost surely, 2^21241696 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 21241696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27578880).

21241696 is an abundant number, since it is smaller than the sum of its proper divisors (33916064).

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

21241696 is a wasteful number, since it uses less digits than its factorization.

21241696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 82 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 21241696 is about 4608.8714453758. The cubic root of 21241696 is about 276.9468286687.

The spelling of 21241696 in words is "twenty-one million, two hundred forty-one thousand, six hundred ninety-six".