133111221 has 4 divisors (see below), whose sum is σ = 177481632. Its totient is φ = 88740812.

The previous prime is 133111219. The next prime is 133111261. The reversal of 133111221 is 122111331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 133111221 - 2¹ = 133111219 is a prime.

It is a super-2 number, since 2×133111221² = 35437194312221682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 133111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133111261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22185201 + ... + 22185206.

It is an arithmetic number, because the mean of its divisors is an integer number (44370408).

Almost surely, 2^133111221 is an apocalyptic number.

It is an amenable number.

133111221 is a deficient number, since it is larger than the sum of its proper divisors (44370411).

133111221 is an equidigital number, since it uses as much as digits as its factorization.

133111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44370410.

The product of its digits is 36, while the sum is 15.

The square root of 133111221 is about 11537.3836288822. The cubic root of 133111221 is about 510.5891193020.

Adding to 133111221 its reverse (122111331), we get a palindrome (255222552).

The spelling of 133111221 in words is "one hundred thirty-three million, one hundred eleven thousand, two hundred twenty-one".