20123432033021 has 4 divisors (see below), whose sum is σ = 20667308574492. Its totient is φ = 19579555491552.

The previous prime is 20123432032981. The next prime is 20123432033027. The reversal of 20123432033021 is 12033023432102.

It is a happy number.

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 15773646276025 + 4349785756996 = 3971605^2 + 2085614^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123432033021 - 2¹⁴ = 20123432016637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123432033027) 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, 271938270680 + ... + 271938270753.

It is an arithmetic number, because the mean of its divisors is an integer number (5166827143623).

Almost surely, 2^{20123432033021} is an apocalyptic number.

It is an amenable number.

20123432033021 is a deficient number, since it is larger than the sum of its proper divisors (543876541471).

20123432033021 is an equidigital number, since it uses as much as digits as its factorization.

20123432033021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543876541470.

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 20123432033021 its reverse (12033023432102), we get a palindrome (32156455465123).

The spelling of 20123432033021 in words is "twenty trillion, one hundred twenty-three billion, four hundred thirty-two million, thirty-three thousand, twenty-one".