221131134 has 80 divisors (see below), whose sum is σ = 571797600. Its totient is φ = 62565696.

The previous prime is 221131111. The next prime is 221131147. The reversal of 221131134 is 431131122.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 122712 + ... + 124500.

It is an arithmetic number, because the mean of its divisors is an integer number (7147470).

Almost surely, 2^221131134 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221131134, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285898800).

221131134 is an abundant number, since it is smaller than the sum of its proper divisors (350666466).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221131134 is a wasteful number, since it uses less digits than its factorization.

221131134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1919 (or 1910 counting only the distinct ones).

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

The square root of 221131134 is about 14870.4786069581. The cubic root of 221131134 is about 604.7139179733.

Adding to 221131134 its reverse (431131122), we get a palindrome (652262256).

The spelling of 221131134 in words is "two hundred twenty-one million, one hundred thirty-one thousand, one hundred thirty-four".