213545444417 has 2 divisors, whose sum is σ = 213545444418. Its totient is φ = 213545444416.

The previous prime is 213545444401. The next prime is 213545444447. The reversal of 213545444417 is 714444545312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192829887376 + 20715557041 = 439124^2 + 143929^2 .

It is a cyclic number.

It is not a de Polignac number, because 213545444417 - 2⁴ = 213545444401 is a prime.

It is not a weakly prime, because it can be changed into another prime (213545444447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106772722208 + 106772722209.

It is an arithmetic number, because the mean of its divisors is an integer number (106772722209).

Almost surely, 2^213545444417 is an apocalyptic number.

It is an amenable number.

213545444417 is a deficient number, since it is larger than the sum of its proper divisors (1).

213545444417 is an equidigital number, since it uses as much as digits as its factorization.

213545444417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1075200, while the sum is 44.

Adding to 213545444417 its reverse (714444545312), we get a palindrome (927989989729).

The spelling of 213545444417 in words is "two hundred thirteen billion, five hundred forty-five million, four hundred forty-four thousand, four hundred seventeen".