21023131310101 has 4 divisors (see below), whose sum is σ = 21057426794092. Its totient is φ = 20988835826112.

The previous prime is 21023131310063. The next prime is 21023131310141. The reversal of 21023131310101 is 10101313132012.

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 10335292671025 + 10687838639076 = 3214855^2 + 3269226^2 .

It is a cyclic number.

It is not a de Polignac number, because 21023131310101 - 2³⁹ = 20473375496213 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 (21023131310141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17147741076 + ... + 17147742301.

It is an arithmetic number, because the mean of its divisors is an integer number (5264356698523).

Almost surely, 2^{21023131310101} is an apocalyptic number.

It is an amenable number.

21023131310101 is a deficient number, since it is larger than the sum of its proper divisors (34295483991).

21023131310101 is an equidigital number, since it uses as much as digits as its factorization.

21023131310101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34295483990.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 21023131310101 its reverse (10101313132012), we get a palindrome (31124444442113).

The spelling of 21023131310101 in words is "twenty-one trillion, twenty-three billion, one hundred thirty-one million, three hundred ten thousand, one hundred one".