20011212233 has 4 divisors (see below), whose sum is σ = 20068551300. Its totient is φ = 19953873168.

The previous prime is 20011212197. The next prime is 20011212241. The reversal of 20011212233 is 33221211002.

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 11056943104 + 8954269129 = 105152^2 + 94627^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011212233 - 2¹² = 20011208137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011212283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28669010 + ... + 28669707.

It is an arithmetic number, because the mean of its divisors is an integer number (5017137825).

Almost surely, 2^20011212233 is an apocalyptic number.

It is an amenable number.

20011212233 is a deficient number, since it is larger than the sum of its proper divisors (57339067).

20011212233 is an equidigital number, since it uses as much as digits as its factorization.

20011212233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57339066.

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

Adding to 20011212233 its reverse (33221211002), we get a palindrome (53232423235).

The spelling of 20011212233 in words is "twenty billion, eleven million, two hundred twelve thousand, two hundred thirty-three".