28020821709443 has 2 divisors, whose sum is σ = 28020821709444. Its totient is φ = 28020821709442.

The previous prime is 28020821709367. The next prime is 28020821709499. The reversal of 28020821709443 is 34490712802082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28020821709443 - 2¹⁶ = 28020821643907 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28020821709391 and 28020821709400.

It is not a weakly prime, because it can be changed into another prime (28020821709743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14010410854721 + 14010410854722.

It is an arithmetic number, because the mean of its divisors is an integer number (14010410854722).

Almost surely, 2^{28020821709443} is an apocalyptic number.

28020821709443 is a deficient number, since it is larger than the sum of its proper divisors (1).

28020821709443 is an equidigital number, since it uses as much as digits as its factorization.

28020821709443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1548288, while the sum is 50.

The spelling of 28020821709443 in words is "twenty-eight trillion, twenty billion, eight hundred twenty-one million, seven hundred nine thousand, four hundred forty-three".