21080466 has 64 divisors (see below), whose sum is σ = 53360640. Its totient is φ = 6106320.

The previous prime is 21080447. The next prime is 21080467. The reversal of 21080466 is 66408012.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21080467) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12891 + ... + 14433.

It is an arithmetic number, because the mean of its divisors is an integer number (833760).

Almost surely, 2^21080466 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21080466, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26680320).

21080466 is an abundant number, since it is smaller than the sum of its proper divisors (32280174).

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

21080466 is a wasteful number, since it uses less digits than its factorization.

21080466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588 (or 1582 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 21080466 is about 4591.3468612162. The cubic root of 21080466 is about 276.2443488262.

Adding to 21080466 its reverse (66408012), we get a palindrome (87488478).

The spelling of 21080466 in words is "twenty-one million, eighty thousand, four hundred sixty-six".