21120066602 has 16 divisors (see below), whose sum is σ = 31797589824. Its totient is φ = 10520904000.

The previous prime is 21120066589. The next prime is 21120066689. The reversal of 21120066602 is 20666002112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1467602 + ... + 1481922.

It is an arithmetic number, because the mean of its divisors is an integer number (1987349364).

Almost surely, 2^21120066602 is an apocalyptic number.

21120066602 is a deficient number, since it is larger than the sum of its proper divisors (10677523222).

21120066602 is a wasteful number, since it uses less digits than its factorization.

21120066602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17005.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 21120066602 its reverse (20666002112), we get a palindrome (41786068714).

The spelling of 21120066602 in words is "twenty-one billion, one hundred twenty million, sixty-six thousand, six hundred two".