28221037181 has 8 divisors (see below), whose sum is σ = 28252592640. Its totient is φ = 28189502992.

The previous prime is 28221037171. The next prime is 28221037199. The reversal of 28221037181 is 18173012282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28221037181 - 2³⁴ = 11041167997 is a prime.

It is a super-3 number, since 3×28221037181³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28221037171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4413935 + ... + 4420323.

It is an arithmetic number, because the mean of its divisors is an integer number (3531574080).

Almost surely, 2^28221037181 is an apocalyptic number.

It is an amenable number.

28221037181 is a deficient number, since it is larger than the sum of its proper divisors (31555459).

28221037181 is a wasteful number, since it uses less digits than its factorization.

28221037181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10635.

The product of its (nonzero) digits is 10752, while the sum is 35.

The spelling of 28221037181 in words is "twenty-eight billion, two hundred twenty-one million, thirty-seven thousand, one hundred eighty-one".