221232421100 has 18 divisors (see below), whose sum is σ = 480074354004. Its totient is φ = 88492968400.

The previous prime is 221232421097. The next prime is 221232421139. The reversal of 221232421100 is 1124232122.

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1106162006 + ... + 1106162205.

Almost surely, 2^221232421100 is an apocalyptic number.

221232421100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221232421100 is an abundant number, since it is smaller than the sum of its proper divisors (258841932904).

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

221232421100 is a wasteful number, since it uses less digits than its factorization.

221232421100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2212324225 (or 2212324218 counting only the distinct ones).

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

Adding to 221232421100 its reverse (1124232122), we get a palindrome (222356653222).

The spelling of 221232421100 in words is "two hundred twenty-one billion, two hundred thirty-two million, four hundred twenty-one thousand, one hundred".