213215311 has 2 divisors, whose sum is σ = 213215312. Its totient is φ = 213215310.

The previous prime is 213215291. The next prime is 213215323. The reversal of 213215311 is 113512312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213215311 - 2⁷ = 213215183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213215341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106607655 + 106607656.

It is an arithmetic number, because the mean of its divisors is an integer number (106607656).

Almost surely, 2^213215311 is an apocalyptic number.

213215311 is a deficient number, since it is larger than the sum of its proper divisors (1).

213215311 is an equidigital number, since it uses as much as digits as its factorization.

213215311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 180, while the sum is 19.

The square root of 213215311 is about 14601.8940894666. The cubic root of 213215311 is about 597.4104238305.

Adding to 213215311 its reverse (113512312), we get a palindrome (326727623).

The spelling of 213215311 in words is "two hundred thirteen million, two hundred fifteen thousand, three hundred eleven".