221121202210220 has 24 divisors (see below), whose sum is σ = 500074103460624. Its totient is φ = 81644751585216.

The previous prime is 221121202210219. The next prime is 221121202210289. The reversal of 221121202210220 is 22012202121122.

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 = 221121202210192 and 221121202210201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425233080914 + ... + 425233081433.

It is an arithmetic number, because the mean of its divisors is an integer number (20836420977526).

Almost surely, 2^{221121202210220} is an apocalyptic number.

221121202210220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221121202210220 is an abundant number, since it is smaller than the sum of its proper divisors (278952901250404).

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

221121202210220 is a wasteful number, since it uses less digits than its factorization.

221121202210220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850466162369 (or 850466162367 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221121202210220 its reverse (22012202121122), we get a palindrome (243133404331342).

The spelling of 221121202210220 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, two hundred two million, two hundred ten thousand, two hundred twenty".