21791066810 has 32 divisors (see below), whose sum is σ = 39827894400. Its totient is φ = 8583188032.

The previous prime is 21791066723. The next prime is 21791066821. The reversal of 21791066810 is 1866019712.

It is a super-2 number, since 2×21791066810² (a number of 21 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 117716 + ... + 239664.

It is an arithmetic number, because the mean of its divisors is an integer number (1244621700).

Almost surely, 2^21791066810 is an apocalyptic number.

21791066810 is a deficient number, since it is larger than the sum of its proper divisors (18036827590).

21791066810 is a wasteful number, since it uses less digits than its factorization.

21791066810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122230.

The product of its (nonzero) digits is 36288, while the sum is 41.

The spelling of 21791066810 in words is "twenty-one billion, seven hundred ninety-one million, sixty-six thousand, eight hundred ten".