21166311662 has 8 divisors (see below), whose sum is σ = 31750512192. Its totient is φ = 10582807600.

The previous prime is 21166311659. The next prime is 21166311707. The reversal of 21166311662 is 26611366112.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90014 + ... + 224577.

It is an arithmetic number, because the mean of its divisors is an integer number (3968814024).

Almost surely, 2^21166311662 is an apocalyptic number.

21166311662 is a deficient number, since it is larger than the sum of its proper divisors (10584200530).

21166311662 is a wasteful number, since it uses less digits than its factorization.

21166311662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348234.

The product of its digits is 15552, while the sum is 35.

Adding to 21166311662 its reverse (26611366112), we get a palindrome (47777677774).

The spelling of 21166311662 in words is "twenty-one billion, one hundred sixty-six million, three hundred eleven thousand, six hundred sixty-two".