20011221233 has 16 divisors (see below), whose sum is σ = 20417443200. Its totient is φ = 19609624320.

The previous prime is 20011221193. The next prime is 20011221239. The reversal of 20011221233 is 33212211002.

It is a cyclic number.

It is not a de Polignac number, because 20011221233 - 2²⁰ = 20010172657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011221239) 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 15 ways as a sum of consecutive naturals, for example, 5378948 + ... + 5382666.

It is an arithmetic number, because the mean of its divisors is an integer number (1276090200).

Almost surely, 2^20011221233 is an apocalyptic number.

It is an amenable number.

20011221233 is a deficient number, since it is larger than the sum of its proper divisors (406221967).

20011221233 is a wasteful number, since it uses less digits than its factorization.

20011221233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4312.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20011221233 its reverse (33212211002), we get a palindrome (53223432235).

The spelling of 20011221233 in words is "twenty billion, eleven million, two hundred twenty-one thousand, two hundred thirty-three".