64051221 has 8 divisors (see below), whose sum is σ = 91971040. Its totient is φ = 39416112.

The previous prime is 64051153. The next prime is 64051249. The reversal of 64051221 is 12215046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64051221 - 2¹⁴ = 64034837 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 (64051721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 821131 + ... + 821208.

It is an arithmetic number, because the mean of its divisors is an integer number (11496380).

Almost surely, 2^64051221 is an apocalyptic number.

It is an amenable number.

64051221 is a deficient number, since it is larger than the sum of its proper divisors (27919819).

64051221 is a wasteful number, since it uses less digits than its factorization.

64051221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642355.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 64051221 is about 8003.2006722311. The cubic root of 64051221 is about 400.1066819615.

Adding to 64051221 its reverse (12215046), we get a palindrome (76266267).

It can be divided in two parts, 6405 and 1221, that added together give a triangular number (7626 = T₁₂₃).

The spelling of 64051221 in words is "sixty-four million, fifty-one thousand, two hundred twenty-one".