20000033221 has 4 divisors (see below), whose sum is σ = 22857180832. Its totient is φ = 17142885612.

The previous prime is 20000033219. The next prime is 20000033269. The reversal of 20000033221 is 12233000002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12233000002 = 2 ⋅6116500001.

It is a cyclic number.

It is not a de Polignac number, because 20000033221 - 2¹ = 20000033219 is a prime.

It is a super-2 number, since 2×20000033221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000033321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1428573795 + ... + 1428573808.

It is an arithmetic number, because the mean of its divisors is an integer number (5714295208).

Almost surely, 2^20000033221 is an apocalyptic number.

It is an amenable number.

20000033221 is a deficient number, since it is larger than the sum of its proper divisors (2857147611).

20000033221 is an equidigital number, since it uses as much as digits as its factorization.

20000033221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2857147610.

The product of its (nonzero) digits is 72, while the sum is 13.

Adding to 20000033221 its reverse (12233000002), we get a palindrome (32233033223).

The spelling of 20000033221 in words is "twenty billion, thirty-three thousand, two hundred twenty-one".