21480606 has 32 divisors (see below), whose sum is σ = 54554880. Its totient is φ = 6137208.

The previous prime is 21480593. The next prime is 21480611. The reversal of 21480606 is 60608412.

It is a super-2 number, since 2×21480606² = 922832868254472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 21480606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28036 + ... + 28791.

It is an arithmetic number, because the mean of its divisors is an integer number (1704840).

Almost surely, 2^21480606 is an apocalyptic number.

21480606 is an abundant number, since it is smaller than the sum of its proper divisors (33074274).

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

21480606 is a wasteful number, since it uses less digits than its factorization.

21480606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56845 (or 56839 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 21480606 is about 4634.7174671171. The cubic root of 21480606 is about 277.9812540195.

The spelling of 21480606 in words is "twenty-one million, four hundred eighty thousand, six hundred six".