221177221122 has 64 divisors (see below), whose sum is σ = 520186665600. Its totient is φ = 61808524800.

The previous prime is 221177221117. The next prime is 221177221189. The reversal of 221177221122 is 221122771122.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 221177221122.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 777172 + ... + 1022912.

It is an arithmetic number, because the mean of its divisors is an integer number (8127916650).

Almost surely, 2^221177221122 is an apocalyptic number.

221177221122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 221177221122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260093332800).

221177221122 is an abundant number, since it is smaller than the sum of its proper divisors (299009444478).

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

221177221122 is a wasteful number, since it uses less digits than its factorization.

221177221122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246819.

The product of its digits is 3136, while the sum is 30.

Adding to 221177221122 its reverse (221122771122), we get a palindrome (442299992244).

The spelling of 221177221122 in words is "two hundred twenty-one billion, one hundred seventy-seven million, two hundred twenty-one thousand, one hundred twenty-two".