20211220233 has 12 divisors (see below), whose sum is σ = 29203543408. Its totient is φ = 13469735160.

The previous prime is 20211220213. The next prime is 20211220247. The reversal of 20211220233 is 33202211202.

20211220233 is a `hidden beast` number, since 2 + 0 + 211 + 220 + 233 = 666.

It is not a de Polignac number, because 20211220233 - 2¹⁰ = 20211219209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20211220213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 338503 + ... + 393708.

Almost surely, 2^20211220233 is an apocalyptic number.

It is an amenable number.

20211220233 is a deficient number, since it is larger than the sum of its proper divisors (8992323175).

20211220233 is a wasteful number, since it uses less digits than its factorization.

20211220233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735284 (or 735281 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20211220233 its reverse (33202211202), we get a palindrome (53413431435).

The spelling of 20211220233 in words is "twenty billion, two hundred eleven million, two hundred twenty thousand, two hundred thirty-three".