221032100320 has 24 divisors (see below), whose sum is σ = 522188337384. Its totient is φ = 88412840064.

The previous prime is 221032100309. The next prime is 221032100321. The reversal of 221032100320 is 23001230122.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 221032100294 and 221032100303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221032100321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 690725154 + ... + 690725473.

It is an arithmetic number, because the mean of its divisors is an integer number (21757847391).

Almost surely, 2^221032100320 is an apocalyptic number.

221032100320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221032100320 is an abundant number, since it is smaller than the sum of its proper divisors (301156237064).

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

221032100320 is a wasteful number, since it uses less digits than its factorization.

221032100320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381450642 (or 1381450634 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 221032100320 its reverse (23001230122), we get a palindrome (244033330442).

The spelling of 221032100320 in words is "two hundred twenty-one billion, thirty-two million, one hundred thousand, three hundred twenty".