84707969921 has 2 divisors, whose sum is σ = 84707969922. Its totient is φ = 84707969920.

The previous prime is 84707969917. The next prime is 84707969923. The reversal of 84707969921 is 12996970748.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55180359025 + 29527610896 = 234905^2 + 171836^2 .

It is a cyclic number.

It is not a de Polignac number, because 84707969921 - 2² = 84707969917 is a prime.

Together with 84707969923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84707969923) 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 as a sum of consecutive naturals, namely, 42353984960 + 42353984961.

It is an arithmetic number, because the mean of its divisors is an integer number (42353984961).

Almost surely, 2^84707969921 is an apocalyptic number.

It is an amenable number.

84707969921 is a deficient number, since it is larger than the sum of its proper divisors (1).

84707969921 is an equidigital number, since it uses as much as digits as its factorization.

84707969921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13716864, while the sum is 62.

The spelling of 84707969921 in words is "eighty-four billion, seven hundred seven million, nine hundred sixty-nine thousand, nine hundred twenty-one".