213212111 has 16 divisors (see below), whose sum is σ = 248700480. Its totient is φ = 179020800.

The previous prime is 213212099. The next prime is 213212117. The reversal of 213212111 is 111212312.

It is not a de Polignac number, because 213212111 - 2¹⁴ = 213195727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213212117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67025 + ... + 70133.

It is an arithmetic number, because the mean of its divisors is an integer number (15543780).

Almost surely, 2^213212111 is an apocalyptic number.

213212111 is a deficient number, since it is larger than the sum of its proper divisors (35488369).

213212111 is a wasteful number, since it uses less digits than its factorization.

213212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3314.

The product of its digits is 24, while the sum is 14.

The square root of 213212111 is about 14601.7845142298. The cubic root of 213212111 is about 597.4074351100.

Adding to 213212111 its reverse (111212312), we get a palindrome (324424423).

It can be divided in two parts, 21321 and 2111, that added together give a palindrome (23432).

The spelling of 213212111 in words is "two hundred thirteen million, two hundred twelve thousand, one hundred eleven".