68123921 has 8 divisors (see below), whose sum is σ = 69552000. Its totient is φ = 66701232.

The previous prime is 68123917. The next prime is 68123963. The reversal of 68123921 is 12932186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68123921 - 2² = 68123917 is a prime.

It is a super-2 number, since 2×68123921² = 9281737224828482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68123221) 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 7 ways as a sum of consecutive naturals, for example, 33080 + ... + 35078.

It is an arithmetic number, because the mean of its divisors is an integer number (8694000).

Almost surely, 2^68123921 is an apocalyptic number.

It is an amenable number.

68123921 is a deficient number, since it is larger than the sum of its proper divisors (1428079).

68123921 is a wasteful number, since it uses less digits than its factorization.

68123921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2695.

The product of its digits is 5184, while the sum is 32.

The square root of 68123921 is about 8253.7216454155. The cubic root of 68123921 is about 408.4133022700.

The spelling of 68123921 in words is "sixty-eight million, one hundred twenty-three thousand, nine hundred twenty-one".