21180040606 has 8 divisors (see below), whose sum is σ = 31770771120. Its totient is φ = 10589783568.

The previous prime is 21180040589. The next prime is 21180040633. The reversal of 21180040606 is 60604008112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31330 + ... + 208186.

It is an arithmetic number, because the mean of its divisors is an integer number (3971346390).

Almost surely, 2^21180040606 is an apocalyptic number.

21180040606 is a deficient number, since it is larger than the sum of its proper divisors (10590730514).

21180040606 is a wasteful number, since it uses less digits than its factorization.

21180040606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236738.

The product of its (nonzero) digits is 2304, while the sum is 28.

Adding to 21180040606 its reverse (60604008112), we get a palindrome (81784048718).

The spelling of 21180040606 in words is "twenty-one billion, one hundred eighty million, forty thousand, six hundred six".