21472080 has 80 divisors (see below), whose sum is σ = 76078464. Its totient is φ = 4907520.

The previous prime is 21472063. The next prime is 21472081. The reversal of 21472080 is 8027412.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×21472080² = 922100439052800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21472080.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21472081) 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 15 ways as a sum of consecutive naturals, for example, 4711 + ... + 8070.

Almost surely, 2^21472080 is an apocalyptic number.

21472080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21472080 is an abundant number, since it is smaller than the sum of its proper divisors (54606384).

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

21472080 is a wasteful number, since it uses less digits than its factorization.

21472080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12804 (or 12798 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 21472080 is about 4633.7975786605. The cubic root of 21472080 is about 277.9444707336.

Adding to 21472080 its reverse (8027412), we get a palindrome (29499492).

The spelling of 21472080 in words is "twenty-one million, four hundred seventy-two thousand, eighty".