21241916 has 12 divisors (see below), whose sum is σ = 37542120. Its totient is φ = 10515600.

The previous prime is 21241901. The next prime is 21241921. The reversal of 21241916 is 61914212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25886 + ... + 26693.

It is an arithmetic number, because the mean of its divisors is an integer number (3128510).

Almost surely, 2^21241916 is an apocalyptic number.

It is an amenable number.

21241916 is a deficient number, since it is larger than the sum of its proper divisors (16300204).

21241916 is a wasteful number, since it uses less digits than its factorization.

21241916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52684 (or 52682 counting only the distinct ones).

The product of its digits is 864, while the sum is 26.

The square root of 21241916 is about 4608.8953123281. The cubic root of 21241916 is about 276.9477847771.

The spelling of 21241916 in words is "twenty-one million, two hundred forty-one thousand, nine hundred sixteen".