221001312100 has 72 divisors (see below), whose sum is σ = 517679991360. Its totient is φ = 81641239680.

The previous prime is 221001312053. The next prime is 221001312107. The reversal of 221001312100 is 1213100122.

It is not an unprimeable number, because it can be changed into a prime (221001312107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1589982 + ... + 1723381.

It is an arithmetic number, because the mean of its divisors is an integer number (7189999880).

Almost surely, 2^221001312100 is an apocalyptic number.

221001312100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221001312100 is an abundant number, since it is smaller than the sum of its proper divisors (296678679260).

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

221001312100 is a wasteful number, since it uses less digits than its factorization.

221001312100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3313429 (or 3313422 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 221001312100 its reverse (1213100122), we get a palindrome (222214412222).

The spelling of 221001312100 in words is "two hundred twenty-one billion, one million, three hundred twelve thousand, one hundred".