21294168 has 32 divisors (see below), whose sum is σ = 60840960. Its totient is φ = 6084000.

The previous prime is 21294151. The next prime is 21294187. The reversal of 21294168 is 86149212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63208 + ... + 63543.

It is an arithmetic number, because the mean of its divisors is an integer number (1901280).

Almost surely, 2^21294168 is an apocalyptic number.

21294168 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21294168 is an abundant number, since it is smaller than the sum of its proper divisors (39546792).

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

21294168 is a wasteful number, since it uses less digits than its factorization.

21294168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126767 (or 126763 counting only the distinct ones).

The product of its digits is 6912, while the sum is 33.

The square root of 21294168 is about 4614.5604341042. The cubic root of 21294168 is about 277.1746824867.

The spelling of 21294168 in words is "twenty-one million, two hundred ninety-four thousand, one hundred sixty-eight".