2221021111220 has 24 divisors (see below), whose sum is σ = 4938505765704. Its totient is φ = 836149124096.

The previous prime is 2221021111189. The next prime is 2221021111223. The reversal of 2221021111220 is 221111201222.

It can be written as a sum of positive squares in 4 ways, for example, as 734699265316 + 1486321845904 = 857146^2 + 1219148^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221021111223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3266207177 + ... + 3266207856.

It is an arithmetic number, because the mean of its divisors is an integer number (205771073571).

Almost surely, 2^{2221021111220} is an apocalyptic number.

2221021111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221021111220 is an abundant number, since it is smaller than the sum of its proper divisors (2717484654484).

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

2221021111220 is a wasteful number, since it uses less digits than its factorization.

2221021111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6532415059 (or 6532415057 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2221021111220 its reverse (221111201222), we get a palindrome (2442132312442).

The spelling of 2221021111220 in words is "two trillion, two hundred twenty-one billion, twenty-one million, one hundred eleven thousand, two hundred twenty".