27821262251 has 4 divisors (see below), whose sum is σ = 27847785000. Its totient is φ = 27794739504.

The previous prime is 27821262241. The next prime is 27821262299. The reversal of 27821262251 is 15226212872.

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

It is a cyclic number.

It is not a de Polignac number, because 27821262251 - 2⁶ = 27821262187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27821262241) 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 3 ways as a sum of consecutive naturals, for example, 13259801 + ... + 13261898.

It is an arithmetic number, because the mean of its divisors is an integer number (6961946250).

Almost surely, 2^27821262251 is an apocalyptic number.

27821262251 is a deficient number, since it is larger than the sum of its proper divisors (26522749).

27821262251 is a wasteful number, since it uses less digits than its factorization.

27821262251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26522748.

The product of its digits is 53760, while the sum is 38.

The spelling of 27821262251 in words is "twenty-seven billion, eight hundred twenty-one million, two hundred sixty-two thousand, two hundred fifty-one".