221021023200 has 72 divisors (see below), whose sum is σ = 719423438328. Its totient is φ = 58938938880.

The previous prime is 221021023133. The next prime is 221021023207. The reversal of 221021023200 is 2320120122.

It is a happy number.

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 221021023200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021023207) 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, 46043647 + ... + 46048446.

It is an arithmetic number, because the mean of its divisors is an integer number (9991992199).

Almost surely, 2^221021023200 is an apocalyptic number.

221021023200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221021023200 is an abundant number, since it is smaller than the sum of its proper divisors (498402415128).

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

221021023200 is a wasteful number, since it uses less digits than its factorization.

221021023200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92092116 (or 92092103 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 221021023200 its reverse (2320120122), we get a palindrome (223341143322).

The spelling of 221021023200 in words is "two hundred twenty-one billion, twenty-one million, twenty-three thousand, two hundred".