2221123123220 has 24 divisors (see below), whose sum is σ = 4664681713608. Its totient is φ = 888387696000.

The previous prime is 2221123123213. The next prime is 2221123123223. The reversal of 2221123123220 is 223213211222.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 253045217296 + 1968077905924 = 503036^2 + 1402882^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221123123223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3550631 + ... + 4129070.

It is an arithmetic number, because the mean of its divisors is an integer number (194361738067).

Almost surely, 2^{2221123123220} is an apocalyptic number.

2221123123220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221123123220 is an abundant number, since it is smaller than the sum of its proper divisors (2443558590388).

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

2221123123220 is a wasteful number, since it uses less digits than its factorization.

2221123123220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7694171 (or 7694169 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 2221123123220 its reverse (223213211222), we get a palindrome (2444336334442).

The spelling of 2221123123220 in words is "two trillion, two hundred twenty-one billion, one hundred twenty-three million, one hundred twenty-three thousand, two hundred twenty".