221121011100 has 144 divisors (see below), whose sum is σ = 738993701376. Its totient is φ = 50451840000.

The previous prime is 221121011093. The next prime is 221121011147. The reversal of 221121011100 is 1110121122.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1914676 + ... + 2026875.

It is an arithmetic number, because the mean of its divisors is an integer number (5131900704).

Almost surely, 2^221121011100 is an apocalyptic number.

221121011100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221121011100 is an abundant number, since it is smaller than the sum of its proper divisors (517872690276).

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

221121011100 is a wasteful number, since it uses less digits than its factorization.

221121011100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3941596 (or 3941589 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 221121011100 its reverse (1110121122), we get a palindrome (222231132222).

The spelling of 221121011100 in words is "two hundred twenty-one billion, one hundred twenty-one million, eleven thousand, one hundred".