221111101100 has 36 divisors (see below), whose sum is σ = 479841126744. Its totient is φ = 88438903680.

The previous prime is 221111101093. The next prime is 221111101153. The reversal of 221111101100 is 1101111122.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1782704 + ... + 1902696.

Almost surely, 2^221111101100 is an apocalyptic number.

221111101100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221111101100 is an abundant number, since it is smaller than the sum of its proper divisors (258730025644).

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

221111101100 is a wasteful number, since it uses less digits than its factorization.

221111101100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138434 (or 138427 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 221111101100 its reverse (1101111122), we get a palindrome (222212212222).

It can be divided in two parts, 22111 and 1101100, that added together give a palindrome (1123211).

The spelling of 221111101100 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred one thousand, one hundred".