221134311 has 12 divisors (see below), whose sum is σ = 328049592. Its totient is φ = 143438256.

The previous prime is 221134297. The next prime is 221134313. The reversal of 221134311 is 113431122.

221134311 is a `hidden beast` number, since 221 + 13 + 431 + 1 = 666.

It is not a de Polignac number, because 221134311 - 2⁶ = 221134247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221134313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 331701 + ... + 332366.

It is an arithmetic number, because the mean of its divisors is an integer number (27337466).

Almost surely, 2^221134311 is an apocalyptic number.

221134311 is a deficient number, since it is larger than the sum of its proper divisors (106915281).

221134311 is a wasteful number, since it uses less digits than its factorization.

221134311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664110 (or 664107 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 221134311 is about 14870.5854289601. The cubic root of 221134311 is about 604.7168139426.

Adding to 221134311 its reverse (113431122), we get a palindrome (334565433).

It can be divided in two parts, 221134 and 311, that added together give a triangular number (221445 = T₆₆₅).

The spelling of 221134311 in words is "two hundred twenty-one million, one hundred thirty-four thousand, three hundred eleven".