221022211220 has 12 divisors (see below), whose sum is σ = 464146643604. Its totient is φ = 88408884480.

The previous prime is 221022211133. The next prime is 221022211237. The reversal of 221022211220 is 22112220122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 107586624016 + 113435587204 = 328004^2 + 336802^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5525555261 + ... + 5525555300.

It is an arithmetic number, because the mean of its divisors is an integer number (38678886967).

Almost surely, 2^221022211220 is an apocalyptic number.

221022211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221022211220 is an abundant number, since it is smaller than the sum of its proper divisors (243124432384).

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

221022211220 is a wasteful number, since it uses less digits than its factorization.

221022211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11051110570 (or 11051110568 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221022211220 its reverse (22112220122), we get a palindrome (243134431342).

It can be divided in two parts, 22102 and 2211220, that added together give a palindrome (2233322).

The spelling of 221022211220 in words is "two hundred twenty-one billion, twenty-two million, two hundred eleven thousand, two hundred twenty".