21470568 has 64 divisors (see below), whose sum is σ = 61724160. Its totient is φ = 6096576.

The previous prime is 21470567. The next prime is 21470591. The reversal of 21470568 is 86507412.

It is not an unprimeable number, because it can be changed into a prime (21470563) 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, 37855 + ... + 38417.

It is an arithmetic number, because the mean of its divisors is an integer number (964440).

Almost surely, 2^21470568 is an apocalyptic number.

21470568 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21470568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30862080).

21470568 is an abundant number, since it is smaller than the sum of its proper divisors (40253592).

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

21470568 is a wasteful number, since it uses less digits than its factorization.

21470568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806 (or 802 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 21470568 is about 4633.6344266677. The cubic root of 21470568 is about 277.9379465729.

The spelling of 21470568 in words is "twenty-one million, four hundred seventy thousand, five hundred sixty-eight".