21068980 has 12 divisors (see below), whose sum is σ = 44244900. Its totient is φ = 8427584.

The previous prime is 21068977. The next prime is 21069007. The reversal of 21068980 is 8986012.

21068980 is nontrivially palindromic in base 14.

It can be written as a sum of positive squares in 2 ways, for example, as 3663396 + 17405584 = 1914^2 + 4172^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526705 + ... + 526744.

It is an arithmetic number, because the mean of its divisors is an integer number (3687075).

Almost surely, 2^21068980 is an apocalyptic number.

21068980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21068980 is an abundant number, since it is smaller than the sum of its proper divisors (23175920).

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

21068980 is a wasteful number, since it uses less digits than its factorization.

21068980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053458 (or 1053456 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 21068980 is about 4590.0958595655. The cubic root of 21068980 is about 276.1941677875.

The spelling of 21068980 in words is "twenty-one million, sixty-eight thousand, nine hundred eighty".