21025168 has 40 divisors (see below), whose sum is σ = 42283008. Its totient is φ = 10121472.

The previous prime is 21025163. The next prime is 21025187. The reversal of 21025168 is 86152012.

It is not an unprimeable number, because it can be changed into a prime (21025163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54705 + ... + 55087.

Almost surely, 2^21025168 is an apocalyptic number.

It is an amenable number.

21025168 is an abundant number, since it is smaller than the sum of its proper divisors (21257840).

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

21025168 is a wasteful number, since it uses less digits than its factorization.

21025168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511 (or 505 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 21025168 is about 4585.3209266092. The cubic root of 21025168 is about 276.0025904679.

The spelling of 21025168 in words is "twenty-one million, twenty-five thousand, one hundred sixty-eight".