20212123133 has 4 divisors (see below), whose sum is σ = 20705101788. Its totient is φ = 19719144480.

The previous prime is 20212123109. The next prime is 20212123159. The reversal of 20212123133 is 33132121202.

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 282307204 + 19929815929 = 16802^2 + 141173^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20212123133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212123193) 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, 246489266 + ... + 246489347.

It is an arithmetic number, because the mean of its divisors is an integer number (5176275447).

Almost surely, 2^20212123133 is an apocalyptic number.

It is an amenable number.

20212123133 is a deficient number, since it is larger than the sum of its proper divisors (492978655).

20212123133 is an equidigital number, since it uses as much as digits as its factorization.

20212123133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492978654.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 20212123133 its reverse (33132121202), we get a palindrome (53344244335).

The spelling of 20212123133 in words is "twenty billion, two hundred twelve million, one hundred twenty-three thousand, one hundred thirty-three".