213742111 has 4 divisors (see below), whose sum is σ = 233173224. Its totient is φ = 194311000.

The previous prime is 213742103. The next prime is 213742141. The reversal of 213742111 is 111247312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213742111 - 2³ = 213742103 is a prime.

It is a super-4 number, since 4×213742111⁴ (a number of 34 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213742141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9715540 + ... + 9715561.

It is an arithmetic number, because the mean of its divisors is an integer number (58293306).

Almost surely, 2^213742111 is an apocalyptic number.

213742111 is a deficient number, since it is larger than the sum of its proper divisors (19431113).

213742111 is a wasteful number, since it uses less digits than its factorization.

213742111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19431112.

The product of its digits is 336, while the sum is 22.

The square root of 213742111 is about 14619.9217166167. The cubic root of 213742111 is about 597.9020348240.

Adding to 213742111 its reverse (111247312), we get a palindrome (324989423).

The spelling of 213742111 in words is "two hundred thirteen million, seven hundred forty-two thousand, one hundred eleven".