28214808638321 has 2 divisors, whose sum is σ = 28214808638322. Its totient is φ = 28214808638320.

The previous prime is 28214808638299. The next prime is 28214808638369. The reversal of 28214808638321 is 12383680841282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23271834679921 + 4942973958400 = 4824089^2 + 2223280^2 .

It is a cyclic number.

It is not a de Polignac number, because 28214808638321 - 2³⁴ = 28197628769137 is a prime.

It is not a weakly prime, because it can be changed into another prime (28214808637321) 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 as a sum of consecutive naturals, namely, 14107404319160 + 14107404319161.

It is an arithmetic number, because the mean of its divisors is an integer number (14107404319161).

Almost surely, 2^{28214808638321} is an apocalyptic number.

It is an amenable number.

28214808638321 is a deficient number, since it is larger than the sum of its proper divisors (1).

28214808638321 is an equidigital number, since it uses as much as digits as its factorization.

28214808638321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7077888, while the sum is 56.

The spelling of 28214808638321 in words is "twenty-eight trillion, two hundred fourteen billion, eight hundred eight million, six hundred thirty-eight thousand, three hundred twenty-one".