221641134 has 96 divisors (see below), whose sum is σ = 541375488. Its totient is φ = 59904000.

The previous prime is 221641129. The next prime is 221641141. The reversal of 221641134 is 431146122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 345454 + ... + 346094.

It is an arithmetic number, because the mean of its divisors is an integer number (5639328).

Almost surely, 2^221641134 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221641134, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270687744).

221641134 is an abundant number, since it is smaller than the sum of its proper divisors (319734354).

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

221641134 is a wasteful number, since it uses less digits than its factorization.

221641134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714 (or 701 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 221641134 is about 14887.6168005494. The cubic root of 221641134 is about 605.1784497388.

Adding to 221641134 its reverse (431146122), we get a palindrome (652787256).

The spelling of 221641134 in words is "two hundred twenty-one million, six hundred forty-one thousand, one hundred thirty-four".