67320010521 has 45 divisors (see below), whose sum is σ = 101811039429. Its totient is φ = 44330468616.

The previous prime is 67320010507. The next prime is 67320010529. The reversal of 67320010521 is 12501002376.

It is a happy number.

The square root of 67320010521 is 259461.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 67320010521 - 2¹⁹ = 67319486233 is a prime.

It is a super-3 number, since 3×67320010521³ (a number of 33 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (67320010529) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 296563810 + ... + 296564036.

Almost surely, 2^67320010521 is an apocalyptic number.

67320010521 is the 259461-st square number.

67320010521 is the 129731-st centered octagonal number.

It is an amenable number.

67320010521 is a deficient number, since it is larger than the sum of its proper divisors (34491028908).

67320010521 is an frugal number, since it uses more digits than its factorization.

67320010521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720 (or 357 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

Adding to 67320010521 its reverse (12501002376), we get a palindrome (79821012897).

The spelling of 67320010521 in words is "sixty-seven billion, three hundred twenty million, ten thousand, five hundred twenty-one".