21230580 has 48 divisors (see below), whose sum is σ = 67939200. Its totient is φ = 4852608.

The previous prime is 21230557. The next prime is 21230591. The reversal of 21230580 is 8503212.

It is a super-3 number, since 3×21230580³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24855 + ... + 25694.

It is an arithmetic number, because the mean of its divisors is an integer number (1415400).

Almost surely, 2^21230580 is an apocalyptic number.

21230580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21230580 is an abundant number, since it is smaller than the sum of its proper divisors (46708620).

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

21230580 is a wasteful number, since it uses less digits than its factorization.

21230580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50568 (or 50566 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21230580 is about 4607.6653524317. The cubic root of 21230580 is about 276.8985105225.

Adding to 21230580 its reverse (8503212), we get a palindrome (29733792).

The spelling of 21230580 in words is "twenty-one million, two hundred thirty thousand, five hundred eighty".