21081160 has 32 divisors (see below), whose sum is σ = 47598840. Its totient is φ = 8402944.

The previous prime is 21081143. The next prime is 21081161. The reversal of 21081160 is 6118012.

It can be written as a sum of positive squares in 4 ways, for example, as 19236996 + 1844164 = 4386^2 + 1358^2 .

It is not an unprimeable number, because it can be changed into a prime (21081161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13374 + ... + 14866.

Almost surely, 2^21081160 is an apocalyptic number.

21081160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21081160 is an abundant number, since it is smaller than the sum of its proper divisors (26517680).

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

21081160 is a wasteful number, since it uses less digits than its factorization.

21081160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1857 (or 1853 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 21081160 is about 4591.4224375459. The cubic root of 21081160 is about 276.2473802499.

Adding to 21081160 its reverse (6118012), we get a palindrome (27199172).

The spelling of 21081160 in words is "twenty-one million, eighty-one thousand, one hundred sixty".