221333020 has 12 divisors (see below), whose sum is σ = 464799384. Its totient is φ = 88533200.

The previous prime is 221332999. The next prime is 221333023. The reversal of 221333020 is 20333122.

It is a junction number, because it is equal to n+sod(n) for n = 221332985 and 221333003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221333023) 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, 5533306 + ... + 5533345.

It is an arithmetic number, because the mean of its divisors is an integer number (38733282).

Almost surely, 2^221333020 is an apocalyptic number.

221333020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221333020 is an abundant number, since it is smaller than the sum of its proper divisors (243466364).

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

221333020 is a wasteful number, since it uses less digits than its factorization.

221333020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11066660 (or 11066658 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 221333020 is about 14877.2652056754. The cubic root of 221333020 is about 604.8978904694.

Adding to 221333020 its reverse (20333122), we get a palindrome (241666142).

The spelling of 221333020 in words is "two hundred twenty-one million, three hundred thirty-three thousand, twenty".