21146368 has 72 divisors (see below), whose sum is σ = 46137168. Its totient is φ = 9633792.

The previous prime is 21146357. The next prime is 21146369. The reversal of 21146368 is 86364112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21146369) 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, 187080 + ... + 187192.

It is an arithmetic number, because the mean of its divisors is an integer number (640794).

Almost surely, 2^21146368 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 21146368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23068584).

21146368 is an abundant number, since it is smaller than the sum of its proper divisors (24990800).

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

21146368 is a wasteful number, since it uses less digits than its factorization.

21146368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 175 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 21146368 is about 4598.5180221458. The cubic root of 21146368 is about 276.5319154768.

The spelling of 21146368 in words is "twenty-one million, one hundred forty-six thousand, three hundred sixty-eight".