221135130 has 64 divisors (see below), whose sum is σ = 591523200. Its totient is φ = 58786560.

The previous prime is 221135039. The next prime is 221135137. The reversal of 221135130 is 31531122.

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

It is not an unprimeable number, because it can be changed into a prime (221135137) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101250 + ... + 103410.

It is an arithmetic number, because the mean of its divisors is an integer number (9242550).

Almost surely, 2^221135130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221135130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295761600).

221135130 is an abundant number, since it is smaller than the sum of its proper divisors (370388070).

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

221135130 is a wasteful number, since it uses less digits than its factorization.

221135130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2556 (or 2550 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 221135130 is about 14870.6129665189. The cubic root of 221135130 is about 604.7175604911.

Adding to 221135130 its reverse (31531122), we get a palindrome (252666252).

The spelling of 221135130 in words is "two hundred twenty-one million, one hundred thirty-five thousand, one hundred thirty".