21331221101023 has 4 divisors (see below), whose sum is σ = 21331243556920. Its totient is φ = 21331198645128.

The previous prime is 21331221100993. The next prime is 21331221101027. The reversal of 21331221101023 is 32010112213312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21331221101023 - 2¹⁷ = 21331220969951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21331221100985 and 21331221101003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331221101027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9737088 + ... + 11724901.

It is an arithmetic number, because the mean of its divisors is an integer number (5332810889230).

Almost surely, 2^{21331221101023} is an apocalyptic number.

21331221101023 is a deficient number, since it is larger than the sum of its proper divisors (22455897).

21331221101023 is an equidigital number, since it uses as much as digits as its factorization.

21331221101023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22455896.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21331221101023 its reverse (32010112213312), we get a palindrome (53341333314335).

The spelling of 21331221101023 in words is "twenty-one trillion, three hundred thirty-one billion, two hundred twenty-one million, one hundred one thousand, twenty-three".