68110821 has 32 divisors (see below), whose sum is σ = 107251200. Its totient is φ = 42638400.

The previous prime is 68110787. The next prime is 68110829. The reversal of 68110821 is 12801186.

It is not a de Polignac number, because 68110821 - 2⁹ = 68110309 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68110829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27796 + ... + 30146.

It is an arithmetic number, because the mean of its divisors is an integer number (3351600).

Almost surely, 2^68110821 is an apocalyptic number.

It is an amenable number.

68110821 is a deficient number, since it is larger than the sum of its proper divisors (39140379).

68110821 is a wasteful number, since it uses less digits than its factorization.

68110821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2426 (or 2420 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 68110821 is about 8252.9280258585. The cubic root of 68110821 is about 408.3871217588.

It can be divided in two parts, 68 and 110821, that added together give a square (110889 = 333²).

The spelling of 68110821 in words is "sixty-eight million, one hundred ten thousand, eight hundred twenty-one".