21311060 has 24 divisors (see below), whose sum is σ = 44993256. Its totient is φ = 8478720.

The previous prime is 21311057. The next prime is 21311071. The reversal of 21311060 is 6011312.

It can be written as a sum of positive squares in 4 ways, for example, as 114244 + 21196816 = 338^2 + 4604^2 .

It is a super-2 number, since 2×21311060² = 908322556647200, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 1100 + ... + 6620.

It is an arithmetic number, because the mean of its divisors is an integer number (1874719).

Almost surely, 2^21311060 is an apocalyptic number.

21311060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21311060 is an abundant number, since it is smaller than the sum of its proper divisors (23682196).

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

21311060 is a wasteful number, since it uses less digits than its factorization.

21311060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5723 (or 5721 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 21311060 is about 4616.3903647764. The cubic root of 21311060 is about 277.2479544618.

Adding to 21311060 its reverse (6011312), we get a palindrome (27322372).

The spelling of 21311060 in words is "twenty-one million, three hundred eleven thousand, sixty".