2221121020 has 96 divisors (see below), whose sum is σ = 4982806080. Its totient is φ = 830269440.

The previous prime is 2221120999. The next prime is 2221121051. The reversal of 2221121020 is 201211222.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2369992 + ... + 2370928.

It is an arithmetic number, because the mean of its divisors is an integer number (51904230).

Almost surely, 2^2221121020 is an apocalyptic number.

2221121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2221121020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2491403040).

2221121020 is an abundant number, since it is smaller than the sum of its proper divisors (2761685060).

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

2221121020 is a wasteful number, since it uses less digits than its factorization.

2221121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103 (or 1101 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2221121020 is about 47128.7706183813. The cubic root of 2221121020 is about 1304.7402917274.

Adding to 2221121020 its reverse (201211222), we get a palindrome (2422332242).

The spelling of 2221121020 in words is "two billion, two hundred twenty-one million, one hundred twenty-one thousand, twenty".