21368896 has 28 divisors (see below), whose sum is σ = 42615612. Its totient is φ = 10631168.

The previous prime is 21368861. The next prime is 21368899. The reversal of 21368896 is 69886312.

It can be written as a sum of positive squares in 2 ways, for example, as 11128896 + 10240000 = 3336^2 + 3200^2 .

It is not an unprimeable number, because it can be changed into a prime (21368899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14196 + ... + 15628.

Almost surely, 2^21368896 is an apocalyptic number.

It is an amenable number.

21368896 is a deficient number, since it is larger than the sum of its proper divisors (21246716).

21368896 is a wasteful number, since it uses less digits than its factorization.

21368896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678 (or 1668 counting only the distinct ones).

The product of its digits is 124416, while the sum is 43.

The square root of 21368896 is about 4622.6503220555. The cubic root of 21368896 is about 277.4985352843.

The spelling of 21368896 in words is "twenty-one million, three hundred sixty-eight thousand, eight hundred ninety-six".