221120434100 has 36 divisors (see below), whose sum is σ = 480577720224. Its totient is φ = 88310592480.

The previous prime is 221120434061. The next prime is 221120434109. The reversal of 221120434100 is 1434021122.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221120434109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1655144 + ... + 1783743.

Almost surely, 2^221120434100 is an apocalyptic number.

221120434100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221120434100 is an abundant number, since it is smaller than the sum of its proper divisors (259457286124).

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

221120434100 is a wasteful number, since it uses less digits than its factorization.

221120434100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3439544 (or 3439537 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 221120434100 its reverse (1434021122), we get a palindrome (222554455222).

The spelling of 221120434100 in words is "two hundred twenty-one billion, one hundred twenty million, four hundred thirty-four thousand, one hundred".