221323001100 has 36 divisors (see below), whose sum is σ = 640361217384. Its totient is φ = 59019466880.

The previous prime is 221323001099. The next prime is 221323001101. The reversal of 221323001100 is 1100323122.

It is an interprime number because it is at equal distance from previous prime (221323001099) and next prime (221323001101).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221323001100.

It is not an unprimeable number, because it can be changed into a prime (221323001101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 368871369 + ... + 368871968.

It is an arithmetic number, because the mean of its divisors is an integer number (17787811594).

Almost surely, 2^221323001100 is an apocalyptic number.

221323001100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221323001100 is an abundant number, since it is smaller than the sum of its proper divisors (419038216284).

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

221323001100 is a wasteful number, since it uses less digits than its factorization.

221323001100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737743354 (or 737743347 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 221323001100 its reverse (1100323122), we get a palindrome (222423324222).

The spelling of 221323001100 in words is "two hundred twenty-one billion, three hundred twenty-three million, one thousand, one hundred".