68003021 has 4 divisors (see below), whose sum is σ = 68348412. Its totient is φ = 67657632.

The previous prime is 68002993. The next prime is 68003027. The reversal of 68003021 is 12030086.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59505796 + 8497225 = 7714^2 + 2915^2 .

It is a cyclic number.

It is not a de Polignac number, because 68003021 - 2¹⁴ = 67986637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68002984 and 68003002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68003027) 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, 172400 + ... + 172793.

It is an arithmetic number, because the mean of its divisors is an integer number (17087103).

Almost surely, 2^68003021 is an apocalyptic number.

It is an amenable number.

68003021 is a deficient number, since it is larger than the sum of its proper divisors (345391).

68003021 is a wasteful number, since it uses less digits than its factorization.

68003021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345390.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 68003021 is about 8246.3944242317. The cubic root of 68003021 is about 408.1715545532.

The spelling of 68003021 in words is "sixty-eight million, three thousand, twenty-one".