64854021 has 4 divisors (see below), whose sum is σ = 86472032. Its totient is φ = 43236012.

The previous prime is 64853993. The next prime is 64854029. The reversal of 64854021 is 12045846.

64854021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 64854021 - 2¹³ = 64845829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64854021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64854029) 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 3 ways as a sum of consecutive naturals, for example, 10809001 + ... + 10809006.

It is an arithmetic number, because the mean of its divisors is an integer number (21618008).

Almost surely, 2^64854021 is an apocalyptic number.

It is an amenable number.

64854021 is a deficient number, since it is larger than the sum of its proper divisors (21618011).

64854021 is a wasteful number, since it uses less digits than its factorization.

64854021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21618010.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 64854021 is about 8053.1994263150. The cubic root of 64854021 is about 401.7713545948.

Adding to 64854021 its reverse (12045846), we get a palindrome (76899867).

The spelling of 64854021 in words is "sixty-four million, eight hundred fifty-four thousand, twenty-one".