21165326221708 has 6 divisors (see below), whose sum is σ = 37039320887996. Its totient is φ = 10582663110852.

The previous prime is 21165326221657. The next prime is 21165326221771. The reversal of 21165326221708 is 80712262356112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2645665777710 + ... + 2645665777717.

Almost surely, 2^{21165326221708} is an apocalyptic number.

It is an amenable number.

21165326221708 is a deficient number, since it is larger than the sum of its proper divisors (15873994666288).

21165326221708 is a wasteful number, since it uses less digits than its factorization.

21165326221708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5291331555431 (or 5291331555429 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 21165326221708 in words is "twenty-one trillion, one hundred sixty-five billion, three hundred twenty-six million, two hundred twenty-one thousand, seven hundred eight".