221121222222020 has 48 divisors (see below), whose sum is σ = 464809645434288. Its totient is φ = 88361835724800.

The previous prime is 221121222221971. The next prime is 221121222222059. The reversal of 221121222222020 is 20222222121122.

It can be written as a sum of positive squares in 8 ways, for example, as 47443193961604 + 173678028260416 = 6887902^2 + 13178696^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123650174 + ... + 125425706.

It is an arithmetic number, because the mean of its divisors is an integer number (9683534279881).

Almost surely, 2^{221121222222020} is an apocalyptic number.

221121222222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221121222222020 is an abundant number, since it is smaller than the sum of its proper divisors (243688423212268).

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

221121222222020 is a wasteful number, since it uses less digits than its factorization.

221121222222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1781640 (or 1781638 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 221121222222020 its reverse (20222222121122), we get a palindrome (241343444343142).

The spelling of 221121222222020 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, twenty".