21080602 has 16 divisors (see below), whose sum is σ = 32775912. Its totient is φ = 10160640.

The previous prime is 21080599. The next prime is 21080611. The reversal of 21080602 is 20608012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8767521 + 12313081 = 2961^2 + 3509^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21080602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7102 + ... + 9622.

Almost surely, 2^21080602 is an apocalyptic number.

21080602 is a deficient number, since it is larger than the sum of its proper divisors (11695310).

21080602 is a wasteful number, since it uses less digits than its factorization.

21080602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2673.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 21080602 is about 4591.3616716613. The cubic root of 21080602 is about 276.2449428857.

Adding to 21080602 its reverse (20608012), we get a palindrome (41688614).

The spelling of 21080602 in words is "twenty-one million, eighty thousand, six hundred two".