11221221100 has 18 divisors (see below), whose sum is σ = 24350050004. Its totient is φ = 4488488400.

The previous prime is 11221221097. The next prime is 11221221101. The reversal of 11221221100 is 112212211.

It is not an unprimeable number, because it can be changed into a prime (11221221101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 56106006 + ... + 56106205.

Almost surely, 2^11221221100 is an apocalyptic number.

11221221100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11221221100 is an abundant number, since it is smaller than the sum of its proper divisors (13128828904).

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

11221221100 is a wasteful number, since it uses less digits than its factorization.

11221221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112212225 (or 112212218 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 11221221100 its reverse (112212211), we get a palindrome (11333433311).

11221221100 divided by its reverse (112212211) gives a square (100 = 10²).

The spelling of 11221221100 in words is "eleven billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred".