65421971 has 2 divisors, whose sum is σ = 65421972. Its totient is φ = 65421970.

The previous prime is 65421953. The next prime is 65421989. The reversal of 65421971 is 17912456.

65421971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (65421953) and next prime (65421989).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65421971 is a prime.

It is not a weakly prime, because it can be changed into another prime (65421901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32710985 + 32710986.

It is an arithmetic number, because the mean of its divisors is an integer number (32710986).

Almost surely, 2^65421971 is an apocalyptic number.

65421971 is a deficient number, since it is larger than the sum of its proper divisors (1).

65421971 is an equidigital number, since it uses as much as digits as its factorization.

65421971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 35.

The square root of 65421971 is about 8088.3849438562. The cubic root of 65421971 is about 402.9407663333.

The spelling of 65421971 in words is "sixty-five million, four hundred twenty-one thousand, nine hundred seventy-one".