21175378106 has 8 divisors (see below), whose sum is σ = 32283773364. Its totient is φ = 10414120320.

The previous prime is 21175378097. The next prime is 21175378123. The reversal of 21175378106 is 60187357112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20666650081 + 508728025 = 143759^2 + 22555^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 86784215 + ... + 86784458.

Almost surely, 2^21175378106 is an apocalyptic number.

21175378106 is a deficient number, since it is larger than the sum of its proper divisors (11108395258).

21175378106 is a wasteful number, since it uses less digits than its factorization.

21175378106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173568736.

The product of its (nonzero) digits is 70560, while the sum is 41.

The spelling of 21175378106 in words is "twenty-one billion, one hundred seventy-five million, three hundred seventy-eight thousand, one hundred six".