21080352 has 24 divisors (see below), whose sum is σ = 55336176. Its totient is φ = 7026752.

The previous prime is 21080333. The next prime is 21080369. The reversal of 21080352 is 25308012.

It is a tau number, because it is divible by the number of its divisors (24).

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, 109698 + ... + 109889.

It is an arithmetic number, because the mean of its divisors is an integer number (2305674).

Almost surely, 2^21080352 is an apocalyptic number.

It is an amenable number.

21080352 is an abundant number, since it is smaller than the sum of its proper divisors (34255824).

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

21080352 is a wasteful number, since it uses less digits than its factorization.

21080352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219600 (or 219592 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21080352 is about 4591.3344465417. The cubic root of 21080352 is about 276.2438508626.

Adding to 21080352 its reverse (25308012), we get a palindrome (46388364).

The spelling of 21080352 in words is "twenty-one million, eighty thousand, three hundred fifty-two".