21323130130021 has 4 divisors (see below), whose sum is σ = 21326963162752. Its totient is φ = 21319297097292.

The previous prime is 21323130129937. The next prime is 21323130130033. The reversal of 21323130130021 is 12003103132312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21323130130021 - 2¹¹ = 21323130127973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21323130129974 and 21323130130001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323130130091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1916508021 + ... + 1916519146.

It is an arithmetic number, because the mean of its divisors is an integer number (5331740790688).

Almost surely, 2^{21323130130021} is an apocalyptic number.

It is an amenable number.

21323130130021 is a deficient number, since it is larger than the sum of its proper divisors (3833032731).

21323130130021 is an equidigital number, since it uses as much as digits as its factorization.

21323130130021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3833032730.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 21323130130021 its reverse (12003103132312), we get a palindrome (33326233262333).

The spelling of 21323130130021 in words is "twenty-one trillion, three hundred twenty-three billion, one hundred thirty million, one hundred thirty thousand, twenty-one".