84397772213 has 2 divisors, whose sum is σ = 84397772214. Its totient is φ = 84397772212.

The previous prime is 84397772197. The next prime is 84397772219. The reversal of 84397772213 is 31227779348.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81580498129 + 2817274084 = 285623^2 + 53078^2 .

It is a cyclic number.

It is not a de Polignac number, because 84397772213 - 2⁴ = 84397772197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84397772219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42198886106 + 42198886107.

It is an arithmetic number, because the mean of its divisors is an integer number (42198886107).

Almost surely, 2^84397772213 is an apocalyptic number.

It is an amenable number.

84397772213 is a deficient number, since it is larger than the sum of its proper divisors (1).

84397772213 is an equidigital number, since it uses as much as digits as its factorization.

84397772213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3556224, while the sum is 53.

The spelling of 84397772213 in words is "eighty-four billion, three hundred ninety-seven million, seven hundred seventy-two thousand, two hundred thirteen".