84347252221 has 2 divisors, whose sum is σ = 84347252222. Its totient is φ = 84347252220.

The previous prime is 84347252201. The next prime is 84347252243. The reversal of 84347252221 is 12225274348.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69558260121 + 14788992100 = 263739^2 + 121610^2 .

It is a cyclic number.

It is not a de Polignac number, because 84347252221 - 2¹⁷ = 84347121149 is a prime.

It is a super-2 number, since 2×84347252221² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84347252201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42173626110 + 42173626111.

It is an arithmetic number, because the mean of its divisors is an integer number (42173626111).

Almost surely, 2^84347252221 is an apocalyptic number.

It is an amenable number.

84347252221 is a deficient number, since it is larger than the sum of its proper divisors (1).

84347252221 is an equidigital number, since it uses as much as digits as its factorization.

84347252221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 215040, while the sum is 40.

The spelling of 84347252221 in words is "eighty-four billion, three hundred forty-seven million, two hundred fifty-two thousand, two hundred twenty-one".