21041368 has 8 divisors (see below), whose sum is σ = 39452580. Its totient is φ = 10520680.

The previous prime is 21041357. The next prime is 21041369. The reversal of 21041368 is 86314012.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21041368² = 885478334622848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1315078 + ... + 1315093.

Almost surely, 2^21041368 is an apocalyptic number.

It is an amenable number.

21041368 is a deficient number, since it is larger than the sum of its proper divisors (18411212).

21041368 is a wasteful number, since it uses less digits than its factorization.

21041368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2630177 (or 2630173 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 21041368 is about 4587.0870931344. The cubic root of 21041368 is about 276.0734594075.

The spelling of 21041368 in words is "twenty-one million, forty-one thousand, three hundred sixty-eight".