42064321 has 4 divisors (see below), whose sum is σ = 45300052. Its totient is φ = 38828592.

The previous prime is 42064313. The next prime is 42064331. The reversal of 42064321 is 12346024.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19927296 + 22137025 = 4464^2 + 4705^2 .

It is a cyclic number.

It is not a de Polignac number, because 42064321 - 2³ = 42064313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42064292 and 42064301.

It is not an unprimeable number, because it can be changed into a prime (42064331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1617846 + ... + 1617871.

It is an arithmetic number, because the mean of its divisors is an integer number (11325013).

Almost surely, 2^42064321 is an apocalyptic number.

It is an amenable number.

42064321 is a deficient number, since it is larger than the sum of its proper divisors (3235731).

42064321 is a wasteful number, since it uses less digits than its factorization.

42064321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3235730.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 42064321 is about 6485.7012728000. The cubic root of 42064321 is about 347.7800196252.

The spelling of 42064321 in words is "forty-two million, sixty-four thousand, three hundred twenty-one".