64331421 has 16 divisors (see below), whose sum is σ = 106940928. Its totient is φ = 33418800.

The previous prime is 64331413. The next prime is 64331489. The reversal of 64331421 is 12413346.

It is not a de Polignac number, because 64331421 - 2³ = 64331413 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 64331391 and 64331400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64331521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139015 + ... + 139476.

It is an arithmetic number, because the mean of its divisors is an integer number (6683808).

Almost surely, 2^64331421 is an apocalyptic number.

It is an amenable number.

64331421 is a deficient number, since it is larger than the sum of its proper divisors (42609507).

64331421 is a wasteful number, since it uses less digits than its factorization.

64331421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278512.

The product of its digits is 1728, while the sum is 24.

The square root of 64331421 is about 8020.6870653330. The cubic root of 64331421 is about 400.6892719947.

Adding to 64331421 its reverse (12413346), we get a palindrome (76744767).

The spelling of 64331421 in words is "sixty-four million, three hundred thirty-one thousand, four hundred twenty-one".