20023010111021 has 4 divisors (see below), whose sum is σ = 20564172546492. Its totient is φ = 19481847675552.

The previous prime is 20023010110991. The next prime is 20023010111053. The reversal of 20023010111021 is 12011101032002.

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 16387356496900 + 3635653614121 = 4048130^2 + 1906739^2 .

It is a cyclic number.

It is not a de Polignac number, because 20023010111021 - 2³⁸ = 19748132204077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20023010110987 and 20023010111005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20023010111821) 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, 270581217680 + ... + 270581217753.

It is an arithmetic number, because the mean of its divisors is an integer number (5141043136623).

Almost surely, 2^{20023010111021} is an apocalyptic number.

It is an amenable number.

20023010111021 is a deficient number, since it is larger than the sum of its proper divisors (541162435471).

20023010111021 is an equidigital number, since it uses as much as digits as its factorization.

20023010111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541162435470.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20023010111021 its reverse (12011101032002), we get a palindrome (32034111143023).

The spelling of 20023010111021 in words is "twenty trillion, twenty-three billion, ten million, one hundred eleven thousand, twenty-one".