21894168 has 32 divisors (see below), whose sum is σ = 55137600. Its totient is φ = 7244448.

The previous prime is 21894167. The next prime is 21894211. The reversal of 21894168 is 86149812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21894167) 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, 55 + ... + 6617.

It is an arithmetic number, because the mean of its divisors is an integer number (1723050).

Almost surely, 2^21894168 is an apocalyptic number.

It is an amenable number.

21894168 is an abundant number, since it is smaller than the sum of its proper divisors (33243432).

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

21894168 is a wasteful number, since it uses less digits than its factorization.

21894168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6711 (or 6707 counting only the distinct ones).

The product of its digits is 27648, while the sum is 39.

The square root of 21894168 is about 4679.1204301663. The cubic root of 21894168 is about 279.7538994043.

The spelling of 21894168 in words is "twenty-one million, eight hundred ninety-four thousand, one hundred sixty-eight".