67056421 has 4 divisors (see below), whose sum is σ = 67091500. Its totient is φ = 67021344.

The previous prime is 67056419. The next prime is 67056461. The reversal of 67056421 is 12465076.

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 32376100 + 34680321 = 5690^2 + 5889^2 .

It is a cyclic number.

It is not a de Polignac number, because 67056421 - 2¹ = 67056419 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 (67056401) 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 3 ways as a sum of consecutive naturals, for example, 14496 + ... + 18553.

It is an arithmetic number, because the mean of its divisors is an integer number (16772875).

Almost surely, 2^67056421 is an apocalyptic number.

It is an amenable number.

67056421 is a deficient number, since it is larger than the sum of its proper divisors (35079).

67056421 is a wasteful number, since it uses less digits than its factorization.

67056421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35078.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 67056421 is about 8188.7985077177. The cubic root of 67056421 is about 406.2687863186.

The spelling of 67056421 in words is "sixty-seven million, fifty-six thousand, four hundred twenty-one".