68021971 has 4 divisors (see below), whose sum is σ = 70979472. Its totient is φ = 65064472.

The previous prime is 68021963. The next prime is 68021999. The reversal of 68021971 is 17912086.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 68021971 - 2³ = 68021963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68021071) 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, 1478716 + ... + 1478761.

It is an arithmetic number, because the mean of its divisors is an integer number (17744868).

Almost surely, 2^68021971 is an apocalyptic number.

68021971 is a deficient number, since it is larger than the sum of its proper divisors (2957501).

68021971 is a wasteful number, since it uses less digits than its factorization.

68021971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2957500.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 68021971 is about 8247.5433311987. The cubic root of 68021971 is about 408.2094652837.

The spelling of 68021971 in words is "sixty-eight million, twenty-one thousand, nine hundred seventy-one".