21713166242 has 8 divisors (see below), whose sum is σ = 32592869100. Its totient is φ = 10848876544.

The previous prime is 21713166239. The next prime is 21713166257. The reversal of 21713166242 is 24266131712.

It can be written as a sum of positive squares in 2 ways, for example, as 14626725481 + 7086440761 = 120941^2 + 84181^2 .

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, 3849767 + ... + 3855402.

Almost surely, 2^21713166242 is an apocalyptic number.

21713166242 is a deficient number, since it is larger than the sum of its proper divisors (10879702858).

21713166242 is a wasteful number, since it uses less digits than its factorization.

21713166242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7706580.

The product of its digits is 24192, while the sum is 35.

Adding to 21713166242 its reverse (24266131712), we get a palindrome (45979297954).

The spelling of 21713166242 in words is "twenty-one billion, seven hundred thirteen million, one hundred sixty-six thousand, two hundred forty-two".