21354168 has 64 divisors (see below), whose sum is σ = 59512320. Its totient is φ = 6329600.

The previous prime is 21354167. The next prime is 21354181. The reversal of 21354168 is 86145312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11548 + ... + 13268.

It is an arithmetic number, because the mean of its divisors is an integer number (929880).

Almost surely, 2^21354168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21354168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29756160).

21354168 is an abundant number, since it is smaller than the sum of its proper divisors (38158152).

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

21354168 is a wasteful number, since it uses less digits than its factorization.

21354168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1788 (or 1784 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 21354168 is about 4621.0570219377. The cubic root of 21354168 is about 277.4347675579.

The spelling of 21354168 in words is "twenty-one million, three hundred fifty-four thousand, one hundred sixty-eight".