213020321117 has 2 divisors, whose sum is σ = 213020321118. Its totient is φ = 213020321116.

The previous prime is 213020321021. The next prime is 213020321177. The reversal of 213020321117 is 711123020312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189724709476 + 23295611641 = 435574^2 + 152629^2 .

It is a cyclic number.

It is not a de Polignac number, because 213020321117 - 2¹² = 213020317021 is a prime.

It is a super-2 number, since 2×213020321117² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 213020321092 and 213020321101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213020321177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106510160558 + 106510160559.

It is an arithmetic number, because the mean of its divisors is an integer number (106510160559).

Almost surely, 2^213020321117 is an apocalyptic number.

It is an amenable number.

213020321117 is a deficient number, since it is larger than the sum of its proper divisors (1).

213020321117 is an equidigital number, since it uses as much as digits as its factorization.

213020321117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 23.

Adding to 213020321117 its reverse (711123020312), we get a palindrome (924143341429).

The spelling of 213020321117 in words is "two hundred thirteen billion, twenty million, three hundred twenty-one thousand, one hundred seventeen".