213221117 has 2 divisors, whose sum is σ = 213221118. Its totient is φ = 213221116.

The previous prime is 213221087. The next prime is 213221143. The reversal of 213221117 is 711122312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201242596 + 11978521 = 14186^2 + 3461^2 .

It is a cyclic number.

It is not a de Polignac number, because 213221117 - 2⁶ = 213221053 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213221917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106610558 + 106610559.

It is an arithmetic number, because the mean of its divisors is an integer number (106610559).

Almost surely, 2^213221117 is an apocalyptic number.

It is an amenable number.

213221117 is a deficient number, since it is larger than the sum of its proper divisors (1).

213221117 is an equidigital number, since it uses as much as digits as its factorization.

213221117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168, while the sum is 20.

The square root of 213221117 is about 14602.0928979376. The cubic root of 213221117 is about 597.4158464139.

Adding to 213221117 its reverse (711122312), we get a palindrome (924343429).

The spelling of 213221117 in words is "two hundred thirteen million, two hundred twenty-one thousand, one hundred seventeen".