211233213 has 6 divisors (see below), whose sum is σ = 305114654. Its totient is φ = 140822136.

The previous prime is 211233193. The next prime is 211233221. The reversal of 211233213 is 312332112.

It can be written as a sum of positive squares in only one way, i.e., 126630009 + 84603204 = 11253^2 + 9198^2 .

It is not a de Polignac number, because 211233213 - 2⁶ = 211233149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211233263) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11735170 + ... + 11735187.

Almost surely, 2^211233213 is an apocalyptic number.

It is an amenable number.

211233213 is a deficient number, since it is larger than the sum of its proper divisors (93881441).

211233213 is a wasteful number, since it uses less digits than its factorization.

211233213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23470363 (or 23470360 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 211233213 is about 14533.8643519196. The cubic root of 211233213 is about 595.5534365269.

Adding to 211233213 its reverse (312332112), we get a palindrome (523565325).

It can be divided in two parts, 21123 and 3213, that added together give a square (24336 = 156²).

The spelling of 211233213 in words is "two hundred eleven million, two hundred thirty-three thousand, two hundred thirteen".