221011221210 has 64 divisors (see below), whose sum is σ = 571401855360. Its totient is φ = 54386300160.

The previous prime is 221011221209. The next prime is 221011221239. The reversal of 221011221210 is 12122110122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221011221210.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1230636 + ... + 1398744.

It is an arithmetic number, because the mean of its divisors is an integer number (8928153990).

Almost surely, 2^221011221210 is an apocalyptic number.

221011221210 is an abundant number, since it is smaller than the sum of its proper divisors (350390634150).

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

221011221210 is a wasteful number, since it uses less digits than its factorization.

221011221210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171503.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221011221210 its reverse (12122110122), we get a palindrome (233133331332).

It can be divided in two parts, 2210112 and 21210, that added together give a palindrome (2231322).

The spelling of 221011221210 in words is "two hundred twenty-one billion, eleven million, two hundred twenty-one thousand, two hundred ten".