68071021 has 4 divisors (see below), whose sum is σ = 69654112. Its totient is φ = 66487932.

The previous prime is 68071019. The next prime is 68071049. The reversal of 68071021 is 12017086.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68071021 - 2¹ = 68071019 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 (68071001) 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, 791481 + ... + 791566.

It is an arithmetic number, because the mean of its divisors is an integer number (17413528).

Almost surely, 2^68071021 is an apocalyptic number.

It is an amenable number.

68071021 is a deficient number, since it is larger than the sum of its proper divisors (1583091).

68071021 is a wasteful number, since it uses less digits than its factorization.

68071021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583090.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 68071021 is about 8250.5164080802. The cubic root of 68071021 is about 408.3075603706.

The spelling of 68071021 in words is "sixty-eight million, seventy-one thousand, twenty-one".