213216311 has 32 divisors (see below), whose sum is σ = 277335552. Its totient is φ = 159096960.

The previous prime is 213216287. The next prime is 213216319. The reversal of 213216311 is 113612312.

It is not a de Polignac number, because 213216311 - 2⁶ = 213216247 is a prime.

It is a super-2 number, since 2×213216311² = 90922390552897442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213216319) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 190325 + ... + 191441.

It is an arithmetic number, because the mean of its divisors is an integer number (8666736).

Almost surely, 2^213216311 is an apocalyptic number.

213216311 is a deficient number, since it is larger than the sum of its proper divisors (64119241).

213216311 is a wasteful number, since it uses less digits than its factorization.

213216311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239.

The product of its digits is 216, while the sum is 20.

The square root of 213216311 is about 14601.9283315595. The cubic root of 213216311 is about 597.4113577995.

Adding to 213216311 its reverse (113612312), we get a palindrome (326828623).

The spelling of 213216311 in words is "two hundred thirteen million, two hundred sixteen thousand, three hundred eleven".