68921 has 4 divisors (see below), whose sum is σ = 70644.
Its totient is φ = 67240.
The previous prime is 68917. The next prime is 68927. The reversal of 68921 is 12986.
It can be divided in two parts, 68 and 921, that added together give a palindrome (989).
The cubic root of 68921 is 41.
It is a perfect power (a cube), and thus also a powerful number.
It can be written as a sum of positive squares in 2 ways, for example, as 13225 + 55696 = 115^2 + 236^2
It is not a de Polignac number, because 68921 - 22 = 68917 is a prime.
It is a Duffinian number.
It is a plaindrome in base 9.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 68921.
It is not an unprimeable number, because it can be changed into a prime (68927) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1661 + ... + 1701.
It is an arithmetic number, because the mean of its divisors is an integer number (17661).
268921 is an apocalyptic number.
It is an amenable number.
68921 is a deficient number, since it is larger than the sum of its proper divisors (1723).
68921 is an frugal number, since it uses more digits than its factorization.
68921 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 123 (or 41 counting only the distinct ones).
The product of its digits is 864, while the sum is 26.
The square root of 68921 is about 262.5280937347.
The spelling of 68921 in words is "sixty-eight thousand, nine hundred twenty-one".