21023201221133 has 4 divisors (see below), whose sum is σ = 21034425569628. Its totient is φ = 21011976872640.

The previous prime is 21023201221123. The next prime is 21023201221153. The reversal of 21023201221133 is 33112210232012.

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 4708735081444 + 16314466139689 = 2169962^2 + 4039117^2 .

It is a cyclic number.

It is not a de Polignac number, because 21023201221133 - 2⁴ = 21023201221117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21023201221099 and 21023201221108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023201221123) 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, 5612171438 + ... + 5612175183.

It is an arithmetic number, because the mean of its divisors is an integer number (5258606392407).

Almost surely, 2^{21023201221133} is an apocalyptic number.

It is an amenable number.

21023201221133 is a deficient number, since it is larger than the sum of its proper divisors (11224348495).

21023201221133 is a wasteful number, since it uses less digits than its factorization.

21023201221133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11224348494.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21023201221133 its reverse (33112210232012), we get a palindrome (54135411453145).

The spelling of 21023201221133 in words is "twenty-one trillion, twenty-three billion, two hundred one million, two hundred twenty-one thousand, one hundred thirty-three".