64571421 has 16 divisors (see below), whose sum is σ = 87834240. Its totient is φ = 42187200.

The previous prime is 64571411. The next prime is 64571449. The reversal of 64571421 is 12417546.

64571421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64571421 - 2⁷ = 64571293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64571411) 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 in 15 ways as a sum of consecutive naturals, for example, 30175 + ... + 32243.

It is an arithmetic number, because the mean of its divisors is an integer number (5489640).

Almost surely, 2^64571421 is an apocalyptic number.

It is an amenable number.

64571421 is a deficient number, since it is larger than the sum of its proper divisors (23262819).

64571421 is a wasteful number, since it uses less digits than its factorization.

64571421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2276.

The product of its digits is 6720, while the sum is 30.

The square root of 64571421 is about 8035.6344491272. The cubic root of 64571421 is about 401.1869348969.

Adding to 64571421 its reverse (12417546), we get a palindrome (76988967).

The spelling of 64571421 in words is "sixty-four million, five hundred seventy-one thousand, four hundred twenty-one".