68021711 has 4 divisors (see below), whose sum is σ = 68055624. Its totient is φ = 67987800.

The previous prime is 68021699. The next prime is 68021731. The reversal of 68021711 is 11712086.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11712086 = 2 ⋅5856043.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68021711 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 (68021731) 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, 13745 + ... + 18026.

It is an arithmetic number, because the mean of its divisors is an integer number (17013906).

Almost surely, 2^68021711 is an apocalyptic number.

68021711 is a deficient number, since it is larger than the sum of its proper divisors (33913).

68021711 is a wasteful number, since it uses less digits than its factorization.

68021711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33912.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 68021711 is about 8247.5275689142. The cubic root of 68021711 is about 408.2089451841.

Adding to 68021711 its reverse (11712086), we get a palindrome (79733797).

The spelling of 68021711 in words is "sixty-eight million, twenty-one thousand, seven hundred eleven".