67108821 has 16 divisors (see below), whose sum is σ = 96512640. Its totient is φ = 41232960.

The previous prime is 67108819. The next prime is 67108837. The reversal of 67108821 is 12880176.

It is a happy number.

It is not a de Polignac number, because 67108821 - 2¹ = 67108819 is a prime.

It is a nialpdrome in base 4.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67108721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39375 + ... + 41043.

It is an arithmetic number, because the mean of its divisors is an integer number (6032040).

Almost surely, 2^67108821 is an apocalyptic number.

It is an amenable number.

67108821 is a deficient number, since it is larger than the sum of its proper divisors (29403819).

67108821 is a wasteful number, since it uses less digits than its factorization.

67108821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2716.

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 67108821 is about 8191.9973754879. The cubic root of 67108821 is about 406.3745825090.

Adding to 67108821 its reverse (12880176), we get a palindrome (79988997).

The spelling of 67108821 in words is "sixty-seven million, one hundred eight thousand, eight hundred twenty-one".