84221211278839 has 2 divisors, whose sum is σ = 84221211278840. Its totient is φ = 84221211278838.

The previous prime is 84221211278761. The next prime is 84221211278909. The reversal of 84221211278839 is 93887211212248.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84221211278839 - 2²⁷ = 84221077061111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84221211078839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42110605639419 + 42110605639420.

It is an arithmetic number, because the mean of its divisors is an integer number (42110605639420).

Almost surely, 2^{84221211278839} is an apocalyptic number.

84221211278839 is a deficient number, since it is larger than the sum of its proper divisors (1).

84221211278839 is an equidigital number, since it uses as much as digits as its factorization.

84221211278839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6193152, while the sum is 58.

The spelling of 84221211278839 in words is "eighty-four trillion, two hundred twenty-one billion, two hundred eleven million, two hundred seventy-eight thousand, eight hundred thirty-nine".