20213220233 has 4 divisors (see below), whose sum is σ = 20263627668. Its totient is φ = 20162812800.

The previous prime is 20213220217. The next prime is 20213220241. The reversal of 20213220233 is 33202231202.

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 19929533584 + 283686649 = 141172^2 + 16843^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213220233 - 2⁴ = 20213220217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20213226233) 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, 25203116 + ... + 25203917.

It is an arithmetic number, because the mean of its divisors is an integer number (5065906917).

Almost surely, 2^20213220233 is an apocalyptic number.

It is an amenable number.

20213220233 is a deficient number, since it is larger than the sum of its proper divisors (50407435).

20213220233 is an equidigital number, since it uses as much as digits as its factorization.

20213220233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50407434.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 20213220233 its reverse (33202231202), we get a palindrome (53415451435).

The spelling of 20213220233 in words is "twenty billion, two hundred thirteen million, two hundred twenty thousand, two hundred thirty-three".