21452080 has 40 divisors (see below), whose sum is σ = 53715312. Its totient is φ = 7920384.

The previous prime is 21452071. The next prime is 21452087. The reversal of 21452080 is 8025412.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (21452087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9274 + ... + 11353.

Almost surely, 2^21452080 is an apocalyptic number.

21452080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21452080 is an abundant number, since it is smaller than the sum of its proper divisors (32263232).

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

21452080 is a wasteful number, since it uses less digits than its factorization.

21452080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20653 (or 20647 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 21452080 is about 4631.6390187492. The cubic root of 21452080 is about 277.8581475295.

Adding to 21452080 its reverse (8025412), we get a palindrome (29477492).

It can be divided in two parts, 2145 and 2080, that added together give a square (4225 = 65²).

The spelling of 21452080 in words is "twenty-one million, four hundred fifty-two thousand, eighty".