221321033320 has 16 divisors (see below), whose sum is σ = 497972325060. Its totient is φ = 88528413312.

The previous prime is 221321033281. The next prime is 221321033327. The reversal of 221321033320 is 23330123122.

It can be written as a sum of positive squares in 2 ways, for example, as 220131749124 + 1189284196 = 469182^2 + 34486^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221321033291 and 221321033300.

It is not an unprimeable number, because it can be changed into a prime (221321033327) 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, 2766512877 + ... + 2766512956.

Almost surely, 2^221321033320 is an apocalyptic number.

221321033320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221321033320 is an abundant number, since it is smaller than the sum of its proper divisors (276651291740).

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

221321033320 is a wasteful number, since it uses less digits than its factorization.

221321033320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5533025844 (or 5533025840 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 221321033320 its reverse (23330123122), we get a palindrome (244651156442).

The spelling of 221321033320 in words is "two hundred twenty-one billion, three hundred twenty-one million, thirty-three thousand, three hundred twenty".