84133850877221 has 2 divisors, whose sum is σ = 84133850877222. Its totient is φ = 84133850877220.

The previous prime is 84133850877199. The next prime is 84133850877233. The reversal of 84133850877221 is 12277805833148.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83230041302500 + 903809574721 = 9123050^2 + 950689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84133850877221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84133850877521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42066925438610 + 42066925438611.

It is an arithmetic number, because the mean of its divisors is an integer number (42066925438611).

Almost surely, 2^{84133850877221} is an apocalyptic number.

It is an amenable number.

84133850877221 is a deficient number, since it is larger than the sum of its proper divisors (1).

84133850877221 is an equidigital number, since it uses as much as digits as its factorization.

84133850877221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18063360, while the sum is 59.

The spelling of 84133850877221 in words is "eighty-four trillion, one hundred thirty-three billion, eight hundred fifty million, eight hundred seventy-seven thousand, two hundred twenty-one".