21062880 has 72 divisors (see below), whose sum is σ = 71881992. Its totient is φ = 5616384.

The previous prime is 21062869. The next prime is 21062893. The reversal of 21062880 is 8826012.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-3 number, since 3×21062880³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5874 + ... + 8753.

It is an arithmetic number, because the mean of its divisors is an integer number (998361).

Almost surely, 2^21062880 is an apocalyptic number.

21062880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21062880 is an abundant number, since it is smaller than the sum of its proper divisors (50819112).

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

21062880 is a wasteful number, since it uses less digits than its factorization.

21062880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14648 (or 14637 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 21062880 is about 4589.4313373227. The cubic root of 21062880 is about 276.1675101603.

Adding to 21062880 its reverse (8826012), we get a palindrome (29888892).

The spelling of 21062880 in words is "twenty-one million, sixty-two thousand, eight hundred eighty".