68413021 has 4 divisors (see below), whose sum is σ = 68580700. Its totient is φ = 68245344.

The previous prime is 68413019. The next prime is 68413027. The reversal of 68413021 is 12031486.

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 53085796 + 15327225 = 7286^2 + 3915^2 .

It is a cyclic number.

It is not a de Polignac number, because 68413021 - 2¹ = 68413019 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 (68413027) 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, 83226 + ... + 84043.

It is an arithmetic number, because the mean of its divisors is an integer number (17145175).

Almost surely, 2^68413021 is an apocalyptic number.

It is an amenable number.

68413021 is a deficient number, since it is larger than the sum of its proper divisors (167679).

68413021 is a wasteful number, since it uses less digits than its factorization.

68413021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167678.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 68413021 is about 8271.2164159814. The cubic root of 68413021 is about 408.9902198150.

The spelling of 68413021 in words is "sixty-eight million, four hundred thirteen thousand, twenty-one".