21414580 has 36 divisors (see below), whose sum is σ = 49436100. Its totient is φ = 7786240.

The previous prime is 21414571. The next prime is 21414619. The reversal of 21414580 is 8541412.

It can be written as a sum of positive squares in 2 ways, for example, as 2439844 + 18974736 = 1562^2 + 4356^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2005 + ... + 6844.

It is an arithmetic number, because the mean of its divisors is an integer number (1373225).

Almost surely, 2^21414580 is an apocalyptic number.

21414580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21414580 is an abundant number, since it is smaller than the sum of its proper divisors (28021520).

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

21414580 is a wasteful number, since it uses less digits than its factorization.

21414580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8880 (or 8867 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 21414580 is about 4627.5890050868. The cubic root of 21414580 is about 277.6961467985.

Adding to 21414580 its reverse (8541412), we get a palindrome (29955992).

The spelling of 21414580 in words is "twenty-one million, four hundred fourteen thousand, five hundred eighty".