64118421 has 6 divisors (see below), whose sum is σ = 92615510. Its totient is φ = 42745608.

The previous prime is 64118399. The next prime is 64118437. The reversal of 64118421 is 12481146.

It is a happy number.

64118421 is a `hidden beast` number, since 641 + 18 + 4 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 63776196 + 342225 = 7986^2 + 585^2 .

It is not a de Polignac number, because 64118421 - 2⁵ = 64118389 is a prime.

It is a super-2 number, since 2×64118421² = 8222343823066482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64118321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3562126 + ... + 3562143.

Almost surely, 2^64118421 is an apocalyptic number.

It is an amenable number.

64118421 is a deficient number, since it is larger than the sum of its proper divisors (28497089).

64118421 is a wasteful number, since it uses less digits than its factorization.

64118421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7124275 (or 7124272 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 64118421 is about 8007.3978919497. The cubic root of 64118421 is about 400.2465584078.

Adding to 64118421 its reverse (12481146), we get a palindrome (76599567).

The spelling of 64118421 in words is "sixty-four million, one hundred eighteen thousand, four hundred twenty-one".