2221201213220 has 72 divisors (see below), whose sum is σ = 5177883957624. Its totient is φ = 799712320000.

The previous prime is 2221201213199. The next prime is 2221201213237. The reversal of 2221201213220 is 223121021222.

It can be written as a sum of positive squares in 4 ways, for example, as 1180560479296 + 1040640733924 = 1086536^2 + 1020118^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2221201213192 and 2221201213201.

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 23 ways as a sum of consecutive naturals, for example, 4299401 + ... + 4788240.

It is an arithmetic number, because the mean of its divisors is an integer number (71915054967).

Almost surely, 2^{2221201213220} is an apocalyptic number.

2221201213220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221201213220 is an abundant number, since it is smaller than the sum of its proper divisors (2956682744404).

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

2221201213220 is a wasteful number, since it uses less digits than its factorization.

2221201213220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9087773 (or 9087760 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 2221201213220 its reverse (223121021222), we get a palindrome (2444322234442).

The spelling of 2221201213220 in words is "two trillion, two hundred twenty-one billion, two hundred one million, two hundred thirteen thousand, two hundred twenty".