221102201221220 has 48 divisors (see below), whose sum is σ = 509879513356416. Its totient is φ = 79868344800000.

The previous prime is 221102201221207. The next prime is 221102201221271. The reversal of 221102201221220 is 22122102201122.

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 = 221102201221192 and 221102201221201.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3327814481 + ... + 3327880920.

It is an arithmetic number, because the mean of its divisors is an integer number (10622489861592).

Almost surely, 2^{221102201221220} is an apocalyptic number.

221102201221220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221102201221220 is an abundant number, since it is smaller than the sum of its proper divisors (288777312135196).

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

221102201221220 is a wasteful number, since it uses less digits than its factorization.

221102201221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6655695572 (or 6655695570 counting only the distinct ones).

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

Adding to 221102201221220 its reverse (22122102201122), we get a palindrome (243224303422342).

The spelling of 221102201221220 in words is "two hundred twenty-one trillion, one hundred two billion, two hundred one million, two hundred twenty-one thousand, two hundred twenty".