28020821709499 has 2 divisors, whose sum is σ = 28020821709500. Its totient is φ = 28020821709498.

The previous prime is 28020821709443. The next prime is 28020821709511. The reversal of 28020821709499 is 99490712802082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28020821709499 - 2⁹ = 28020821708987 is a prime.

It is not a weakly prime, because it can be changed into another prime (28020821709299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14010410854749 + 14010410854750.

It is an arithmetic number, because the mean of its divisors is an integer number (14010410854750).

Almost surely, 2^{28020821709499} is an apocalyptic number.

28020821709499 is a deficient number, since it is larger than the sum of its proper divisors (1).

28020821709499 is an equidigital number, since it uses as much as digits as its factorization.

28020821709499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10450944, while the sum is 61.

The spelling of 28020821709499 in words is "twenty-eight trillion, twenty billion, eight hundred twenty-one million, seven hundred nine thousand, four hundred ninety-nine".