221131133 has 4 divisors (see below), whose sum is σ = 224245728. Its totient is φ = 218016540.

The previous prime is 221131111. The next prime is 221131147. The reversal of 221131133 is 331131122.

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 221131133 - 2¹⁰ = 221130109 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 (221131433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1557191 + ... + 1557332.

It is an arithmetic number, because the mean of its divisors is an integer number (56061432).

Almost surely, 2^221131133 is an apocalyptic number.

It is an amenable number.

221131133 is a deficient number, since it is larger than the sum of its proper divisors (3114595).

221131133 is an equidigital number, since it uses as much as digits as its factorization.

221131133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3114594.

The product of its digits is 108, while the sum is 17.

The square root of 221131133 is about 14870.4785733345. The cubic root of 221131133 is about 604.7139170617.

Adding to 221131133 its reverse (331131122), we get a palindrome (552262255).

The spelling of 221131133 in words is "two hundred twenty-one million, one hundred thirty-one thousand, one hundred thirty-three".