68333921 has 6 divisors (see below), whose sum is σ = 70054866. Its totient is φ = 66615600.

The previous prime is 68333917. The next prime is 68333927. The reversal of 68333921 is 12933386.

It can be written as a sum of positive squares in only one way, i.e., 41667025 + 26666896 = 6455^2 + 5164^2 .

It is not a de Polignac number, because 68333921 - 2² = 68333917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68333927) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52286 + ... + 53576.

It is an arithmetic number, because the mean of its divisors is an integer number (11675811).

Almost surely, 2^68333921 is an apocalyptic number.

It is an amenable number.

68333921 is a deficient number, since it is larger than the sum of its proper divisors (1720945).

68333921 is an frugal number, since it uses more digits than its factorization.

68333921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2623 (or 1332 counting only the distinct ones).

The product of its digits is 23328, while the sum is 35.

The square root of 68333921 is about 8266.4333905258. The cubic root of 68333921 is about 408.8325324714.

The spelling of 68333921 in words is "sixty-eight million, three hundred thirty-three thousand, nine hundred twenty-one".