221102121220 has 96 divisors (see below), whose sum is σ = 483492240000. Its totient is φ = 84882868224.

The previous prime is 221102121187. The next prime is 221102121241. The reversal of 221102121220 is 22121201122.

It is a happy number.

It is a super-2 number, since 2×221102121220² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221102121194 and 221102121203.

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, 8921406 + ... + 8946154.

It is an arithmetic number, because the mean of its divisors is an integer number (5036377500).

Almost surely, 2^221102121220 is an apocalyptic number.

221102121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221102121220 is an abundant number, since it is smaller than the sum of its proper divisors (262390118780).

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

221102121220 is a wasteful number, since it uses less digits than its factorization.

221102121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24997 (or 24995 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221102121220 its reverse (22121201122), we get a palindrome (243223322342).

The spelling of 221102121220 in words is "two hundred twenty-one billion, one hundred two million, one hundred twenty-one thousand, two hundred twenty".