221443111100 has 36 divisors (see below), whose sum is σ = 481008015600. Its totient is φ = 88489416960.

The previous prime is 221443111091. The next prime is 221443111133. The reversal of 221443111100 is 1111344122.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

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, 996440 + ... + 1198239.

Almost surely, 2^221443111100 is an apocalyptic number.

221443111100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221443111100 is an abundant number, since it is smaller than the sum of its proper divisors (259564904500).

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

221443111100 is a wasteful number, since it uses less digits than its factorization.

221443111100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2195702 (or 2195695 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 221443111100 its reverse (1111344122), we get a palindrome (222554455222).

The spelling of 221443111100 in words is "two hundred twenty-one billion, four hundred forty-three million, one hundred eleven thousand, one hundred".