21130960 has 20 divisors (see below), whose sum is σ = 49129668. Its totient is φ = 8452352.

The previous prime is 21130939. The next prime is 21130961. The reversal of 21130960 is 6903112.

It can be written as a sum of positive squares in 2 ways, for example, as 7997584 + 13133376 = 2828^2 + 3624^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130961) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 131989 + ... + 132148.

Almost surely, 2^21130960 is an apocalyptic number.

21130960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21130960 is an abundant number, since it is smaller than the sum of its proper divisors (27998708).

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

21130960 is a wasteful number, since it uses less digits than its factorization.

21130960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264150 (or 264144 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 21130960 is about 4596.8423945139. The cubic root of 21130960 is about 276.4647354765.

The spelling of 21130960 in words is "twenty-one million, one hundred thirty thousand, nine hundred sixty".