221522130 has 48 divisors (see below), whose sum is σ = 584086464. Its totient is φ = 58238880.

The previous prime is 221522113. The next prime is 221522137. The reversal of 221522130 is 31225122.

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 (221522137) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10944 + ... + 23723.

It is an arithmetic number, because the mean of its divisors is an integer number (12168468).

Almost surely, 2^221522130 is an apocalyptic number.

221522130 is an abundant number, since it is smaller than the sum of its proper divisors (362564334).

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

221522130 is a wasteful number, since it uses less digits than its factorization.

221522130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34751 (or 34748 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 221522130 is about 14883.6195194583. The cubic root of 221522130 is about 605.0701191411.

Adding to 221522130 its reverse (31225122), we get a palindrome (252747252).

The spelling of 221522130 in words is "two hundred twenty-one million, five hundred twenty-two thousand, one hundred thirty".