21080120 has 32 divisors (see below), whose sum is σ = 49928400. Its totient is φ = 7987968.

The previous prime is 21080117. The next prime is 21080149. The reversal of 21080120 is 2108012.

It is a junction number, because it is equal to n+sod(n) for n = 21080095 and 21080104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13109 + ... + 14628.

Almost surely, 2^21080120 is an apocalyptic number.

21080120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21080120 is an abundant number, since it is smaller than the sum of its proper divisors (28848280).

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

21080120 is a wasteful number, since it uses less digits than its factorization.

21080120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27767 (or 27763 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 21080120 is about 4591.3091814863. The cubic root of 21080120 is about 276.2428374575.

Adding to 21080120 its reverse (2108012), we get a palindrome (23188132).

The spelling of 21080120 in words is "twenty-one million, eighty thousand, one hundred twenty".