221011212220 has 24 divisors (see below), whose sum is σ = 484302831264. Its totient is φ = 84560811456.

The previous prime is 221011212209. The next prime is 221011212221. The reversal of 221011212220 is 22212110122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221011212194 and 221011212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221011212221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240229119 + ... + 240230038.

It is an arithmetic number, because the mean of its divisors is an integer number (20179284636).

Almost surely, 2^221011212220 is an apocalyptic number.

221011212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221011212220 is an abundant number, since it is smaller than the sum of its proper divisors (263291619044).

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

221011212220 is a wasteful number, since it uses less digits than its factorization.

221011212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480459189 (or 480459187 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221011212220 its reverse (22212110122), we get a palindrome (243223322342).

It can be divided in two parts, 22101 and 1212220, that added together give a palindrome (1234321).

The spelling of 221011212220 in words is "two hundred twenty-one billion, eleven million, two hundred twelve thousand, two hundred twenty".