133211111 has 4 divisors (see below), whose sum is σ = 145321224. Its totient is φ = 121101000.

The previous prime is 133211093. The next prime is 133211153. The reversal of 133211111 is 111112331.

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 133211111 - 2²⁶ = 66102247 is a prime.

It is a Duffinian number.

133211111 is a modest number, since divided by 11111 gives 1332 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133211161) 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, 6055040 + ... + 6055061.

It is an arithmetic number, because the mean of its divisors is an integer number (36330306).

Almost surely, 2^133211111 is an apocalyptic number.

133211111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

133211111 is a deficient number, since it is larger than the sum of its proper divisors (12110113).

133211111 is a wasteful number, since it uses less digits than its factorization.

133211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12110112.

The product of its digits is 18, while the sum is 14.

The square root of 133211111 is about 11541.7117881188. The cubic root of 133211111 is about 510.7168069959.

Adding to 133211111 its reverse (111112331), we get a palindrome (244323442).

The spelling of 133211111 in words is "one hundred thirty-three million, two hundred eleven thousand, one hundred eleven".