21480588 has 36 divisors (see below), whose sum is σ = 57493800. Its totient is φ = 6738816.

The previous prime is 21480587. The next prime is 21480593. The reversal of 21480588 is 88508412.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×21480588² = 922831321651488, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21480581) 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 11 ways as a sum of consecutive naturals, for example, 16938 + ... + 18161.

It is an arithmetic number, because the mean of its divisors is an integer number (1597050).

Almost surely, 2^21480588 is an apocalyptic number.

It is an amenable number.

21480588 is an abundant number, since it is smaller than the sum of its proper divisors (36013212).

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

21480588 is a wasteful number, since it uses less digits than its factorization.

21480588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35126 (or 35121 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 21480588 is about 4634.7155252507. The cubic root of 21480588 is about 277.9811763733.

The spelling of 21480588 in words is "twenty-one million, four hundred eighty thousand, five hundred eighty-eight".