221216130 has 32 divisors (see below), whose sum is σ = 589910400. Its totient is φ = 58990896.

The previous prime is 221216129. The next prime is 221216153. The reversal of 221216130 is 31612122.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 409390 + ... + 409929.

It is an arithmetic number, because the mean of its divisors is an integer number (18434700).

Almost surely, 2^221216130 is an apocalyptic number.

221216130 is an abundant number, since it is smaller than the sum of its proper divisors (368694270).

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

221216130 is a wasteful number, since it uses less digits than its factorization.

221216130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819335 (or 819329 counting only the distinct ones).

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

The square root of 221216130 is about 14873.3362094723. The cubic root of 221216130 is about 604.7913858530.

Adding to 221216130 its reverse (31612122), we get a palindrome (252828252).

The spelling of 221216130 in words is "two hundred twenty-one million, two hundred sixteen thousand, one hundred thirty".