221102102220 has 24 divisors (see below), whose sum is σ = 619085886384. Its totient is φ = 58960560576.

The previous prime is 221102102189. The next prime is 221102102239. The reversal of 221102102220 is 22201201122.

It is a super-2 number, since 2×221102102220² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221102102220.

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, 1842517459 + ... + 1842517578.

It is an arithmetic number, because the mean of its divisors is an integer number (25795245266).

Almost surely, 2^221102102220 is an apocalyptic number.

221102102220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221102102220 is an abundant number, since it is smaller than the sum of its proper divisors (397983784164).

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

221102102220 is a wasteful number, since it uses less digits than its factorization.

221102102220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3685035049 (or 3685035047 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221102102220 its reverse (22201201122), we get a palindrome (243303303342).

The spelling of 221102102220 in words is "two hundred twenty-one billion, one hundred two million, one hundred two thousand, two hundred twenty".