221221300033 has 4 divisors (see below), whose sum is σ = 234234317700. Its totient is φ = 208208282368.

The previous prime is 221221300031. The next prime is 221221300049. The reversal of 221221300033 is 330003122122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 139346917264 + 81874382769 = 373292^2 + 286137^2 .

It is a cyclic number.

It is not a de Polignac number, because 221221300033 - 2¹ = 221221300031 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221221300031) 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, 6506508808 + ... + 6506508841.

It is an arithmetic number, because the mean of its divisors is an integer number (58558579425).

Almost surely, 2^221221300033 is an apocalyptic number.

It is an amenable number.

221221300033 is a deficient number, since it is larger than the sum of its proper divisors (13013017667).

221221300033 is a wasteful number, since it uses less digits than its factorization.

221221300033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13013017666.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 221221300033 its reverse (330003122122), we get a palindrome (551224422155).

The spelling of 221221300033 in words is "two hundred twenty-one billion, two hundred twenty-one million, three hundred thousand, thirty-three".