221331203220 has 48 divisors (see below), whose sum is σ = 622320410880. Its totient is φ = 58774697856.

The previous prime is 221331203111. The next prime is 221331203221. The reversal of 221331203220 is 22302133122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221331203221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7702927 + ... + 7731606.

It is an arithmetic number, because the mean of its divisors is an integer number (12965008560).

Almost surely, 2^221331203220 is an apocalyptic number.

221331203220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221331203220 is an abundant number, since it is smaller than the sum of its proper divisors (400989207660).

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

221331203220 is a wasteful number, since it uses less digits than its factorization.

221331203220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15434784 (or 15434782 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 221331203220 its reverse (22302133122), we get a palindrome (243633336342).

The spelling of 221331203220 in words is "two hundred twenty-one billion, three hundred thirty-one million, two hundred three thousand, two hundred twenty".